World Data Center A consists of the Coordination Office and seven Subcenters: World Data Center A Coordination Office National Academy of Sciences 2101 Constitution Avenue, N.W. Washington, D.C., U.S.A., 20418 [Telephone: (202) 389-6478] Glaciology [Snow and Ice]: World Data Center A: Glaciology [Snow and Ice] Inst. of Arctic & Alpine Research University of Colorado Boulder, Colorado, U.S.A. 80309 [Telephone: (303) 492-5171] Meteorology (and Nuclear Radiation): World Data Center A: Meteorology National Climatic Center Federal Building Asheville, North Carolina, U.S.A. 28801 [Telephone: (704) 258-2850] Oceanography: World Data Center A: Oceanography National Oceanic and Atmospheric Administration Washington, D.C., U.S.A. 20235 [Telephone: (202) 634-7249] Rockets and Satellites: World Data Center A: Rockets and Satellites Goddard Space Flight Center Code 601 Greenbelt, Maryland, U.S.A. 20771 [Telephone: (301) 982-6695] Rotation of the Earth: World Data Center A: Rotation of the Earth U.S. Naval Observatory Washington, D.C., U.S.A. 20390 [Telephone: (202) 254-4023] Solar-Terrestrial Physics (Solar and Interplanetary Phenomena, Ionospheric Phenomena, Flare-Associated Events, Geomagnetic Variations, Magnetospheric and Interplanetary Magnetic Phenomena, Aurora, Cosmic Rays, Airglow): World Data Center A for Solar-Terrestrial Physics Environmental Data and Information Service, NOAA Boulder, Colorado, U.S.A. 80303 [Telephone: (303) 499-1000, Ext. 6467] Solid-Earth Geophysics (Seismology, Tsunamis, Gravimetry, Earth Tides, Recent Movements of the Earth's Crust, Magnetic Measurements, Paleomagnetism and Archeomagnetism, Volcanology, Geothermics): World Data Center A for Solid-Earth Geophysics Environmental Data and Information Service, NOAA Boulder, Colorado, U.S.A. 80303 [Telephone: (303) 499-1000, Ext. 6521] NOTES: 1. World Data Centers conduct international exchange of geophysical observations in accordance with the principles set forth by the International Council of Scientific Unions. WDC-A is established in the United States under the auspices of the National Academy of Sciences. 2. Communications regarding data interchange matters in general and World Data Center A as a whole should be addressed to: World Data Center A, Coordination Office (see address above). 3. Inquiries and communications concerning data in specific disciplines should be addressed to the appropriate subcenter listed above. ## CONTENTS | Section | Page | |----------------------------------------------|------| | ABSTRACT | 1 | | SECTION I. GENERAL DISCUSSION | 1 | | 1. Derivation of AE(11-12) Indices for January - June 1975 | 1 | | 2. Precautionary Notes | 5 | | 3. Acknowledgments | 6 | | 4. References | 6 | | SECTION II. TABLES | 9 | | 1. Explanation | 9 | | 2. Table of Monthly Quiet-Time H Reference Values | 10 | | 3. Tables of Hourly Average AE Indices | 11 | | 4. Tables of Hourly Average AL Indices | 17 | | 5. Tables of Hourly Average AU Indices | 23 | | 6. Tables of Hourly Average AO Indices | 29 | | 7. Tables of Observatories Supplying Hourly AU and AL | 36 | | SECTION III. GRAPHS OF INDICES, STATISTICAL DATA AND MAGNETOGRAMS | 49 | | 1. Explanation | 49 | | 2. Daily Graphs of 1.0-min Auroral Electrojet Indices | 51 | | 3. Stacked Common Scale Magnetograms | 82 | | 4. Frequency of AU and AL and Total Amplitude Plots | 88 | AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE (11-12) FOR JANUARY - JUNE 1975 by J.H. Allen, C.C. Abston, J.E. Salazar and J.A. McKinnon National Geophysical and Solar-Terrestrial Data Center Environmental Data and Information Service NOAA, Boulder, Colorado 80303 USA ABSTRACT The Auroral Electrojet index (AE) is discussed and a brief description is given of the derivation of 11-12 station 1.0-min AE indices for January-June 1975. Tables are given of hourly average indices for each day, of the stations making the main contribution to the hourly indices, and of the average monthly quiet-time level of horizontal fields (H) at each magnetic observatory. Graphs of the index variations are included for each day of the first half of 1975 and for the frequency and amplitude of extreme variations at each site. SECTION I. GENERAL DISCUSSION 1. Derivation of AE (11-12) Indices for January-June 1975 Introduction. The Auroral Electrojet index (AE) is designed to provide a global, quantitative measure of auroral zone magnetic activity produced by enhanced ionospheric currents flowing below and within the auroral oval. Ideally, it is the total range of deviation at an instant of time from quiet day values of the horizontal magnetic field (H) around the auroral oval. Defined and developed by Davis and Sugiura [1966], AE has been usefully employed both qualitatively and quantitatively as a correlative index in the studies of substorm morphology, in the behavior of communication satellites, in radio propagation and radio scintillation, and in the coupling between the interplanetary magnetic field and the Earth's magnetosphere. For these varied uses, AE possesses advantages over other geomagnetic indices or at least shares their advantageous properties. In particular it can (1) be derived on an instantaneous basis or from averages of variations computed over any selected interval; (2) be a quantitative index which, in general, is directly related to the processes producing the observed magnetic variations; (3) be well suited to present computer processing techniques because its method of derivation is relatively simple, digital, and objective and; (4) be used to study either individual events or statistical aggregates. These indices are derived in response to indications of need as voiced by the scientific user community in journal articles, at meetings, in resolutions of national and international groups, and in personal communications. This report is one means of communicating a summary of the derived indices for 1 year and is the thirteenth such compilation published by the World Data Center A (WDC-A) for Solar-Terrestrial Physics [Allen, 1972; Allen et al., 1973, 1974a, 1974b, 1974c, 1975a, 1975b, 1975c, 1976, 1977a, 1977b, 1977c and 1977d]. Computer listings or digital magnetic tapes of detailed 2.5-min* indices and microfilm graphs of their variations can be obtained from WDC-A for Solar-Terrestrial Physics, NOAA, Boulder, Colorado 80303, USA. Detailed lists of available indices are given, along with cost of acquisition information in Report UAG-49, Catalog of Standard Geomagnetic Variation Data, WDC-A for Solar-Terrestrial Physics, August 1975. Definition of AE Indices. In practice, AE and associated indices may be defined by describing a graphical technique of derivation that is still used to generate preliminary sets of indices for single events (see Fig. 1). Magnetogram copies for a given UT-day are collected from a select group of auroral zone magnetic observatories. A quiet-time H (horizontal intensity of the Earth's field) reference level is selected for each site and subtracted from the instantaneous H values for that location. The resulting time series of ΔH values for all locations are superposed graphically upon a common zero level and with a common amplitude scale and time base. Connecting successive positive extreme values produces an upper envelope for the set of overlapping traces, and connecting the negative extreme values produces a bounding lower envelope. At any instant, the amplitude of the upper envelope is designated AU and that of the lower envelope is AL. The range between them is defined as AE and their mean is AO. In general, AU is a function of the current flowing in the eastward-directed auroral electrojet, while AL is similarly related to the westward auroral electrojet. *(more recently 1.0-min) Observatory Selection for January-June 1975 AE (11-12). To provide comparable AE indices from year to year, data for the same Northern Hemisphere auroral zone observatories have been used for the derivation of AE(10) for 1966 (Report UAG-37) and 1967 (Report UAG-33); AE (11) for the years 1968 (Report UAG-29), 1969 (Report UAG-31), 1970 (Report UAG-22), 1971 (Report UAG-39), 1972 (Report UAG-45), 1973 (Report UAG-47), 1974 (Report UAG-59) and the first 6 months of 1975 in this report are listed below in Table 1 along with their abbreviations, geographic and geomagnetic coordinates, and time of Local Geomagnetic Midnight (LGM). The station locations are shown relative to the geomagnetic pole (extended geocentric dipole axis) in Figure 2. Table 1. Observatories Used for the Derivation of 1966 and 1967 AE(10)** and 1968, 1969, 1970, 1971, 1972, 1973, 1974 AE(11) and 1975 AE(11-12) | Observatory | Abbreviation | Geographic Coord. | Geomagnetic Coord. | LGM* UT | |----------------------|--------------|-------------------|--------------------|---------| | 1. Leirvogur | LR | 64.18 338.30 | 70.22 71.04 | 2351 | | 2. Narssarssuaq** | NAS | 61.20 314.16 | 71.21 36.79 | 0210 | | 3. Great Whale River | GWR | 55.27 282.22 | 66.58 347.36 | 0526 | | 4. Fort Churchill | FC | 58.80 265.90 | 68.70 322.77 | 0704 | | 5. Yellowknife | YEK | 62.40 245.60 | 69.00 292.80 | 0902 | | 6. College | CO | 64.87 212.17 | 64.63 256.52 | 1133 | | 7. Barrow | BW | 71.30 203.25 | 68.54 241.15 | 1235 | | 8. Cape Wellen # | UE | 66.17 190.17 | 61.79 237.10 | 1250 | | 9. Tixie Bay # | TI | 71.58 129.00 | 60.44 191.41 | 1551 | | 10. Cape Chelyuskin | CC | 77.72 104.28 | 66.26 176.46 | 1650 | | 11. Dixon Island # | DI | 73.55 80.57 | 63.02 161.57 | 1748 | | 12. Abisko | AI | 68.36 18.82 | 66.04 115.08 | 2052 | | 13. Sodankyla** | SO | 67.37 26.63 | 63.76 119.99 | 2032 | * Local Geomagnetic Midnight (LGM) at equinox. Geomagnetic coordinates and time calculated for inclined geocentric dipole field. ** No records available for 1966 and 1967 from NAS, and SO substituted for AI in the 1966 and 1967 AE(10) derivations. # Sometimes given as: Cape Uelen, Tiksi Bay and Dikson Island, respectively. The choice of observatories was based upon a desire to achieve a nearly uniform longitudinal coverage and also to span a range of latitudes so that even contracted oval substorm effects might be recorded. Another consideration was that the magnetograms should come from established observatories whose records would continue to be available on a timely basis through the World Data Center system. Naturally, such a choice involved some compromise between the wish to use as much data as possible and the high cost of digitizing analog magnetograms. Statistical summaries are kept with each derivation, showing the relative contribution of each observatory to the indices to identify possible instances of duplication and to reveal inadequately represented regions. Although we have been able to use the same set of stations for recent years, for earlier years the number of stations providing records changed from time to time. Prior to 1968, the station at Narssarssuaq (NAS) did not exist, and there was no nearby substitute. During most years there have been intervals of varying length for which one or two of the network stations did not produce magnetograms. Further, it is hoped that additional stations may eventually be added to the network to fill longitude gaps. For these reasons we have chosen to indicate the number of contributing stations parenthetically, following the index letters, e.g., AE(10). The daily graphs of variations in 1.0-min AU, AL, AE and AO indices included in this report (Section III) show in the upper right corner the number of contributing stations during the month. If no value is given in the table of monthly average quiet-time H values (Section II-2), this indicates that records from that station were not available for use in the derivation of AE indices. This is also shown by the label on the graphs which reflects the reduced number of contributing stations. Intervals of lost records shorter than 1 month are not indicated. Fig. 1. Preliminary AU(9) and AL(9) by graphical superposition. Graphically derived AU(9) and AL(9) indices are formed by superposing $\Delta H$ traces from nine auroral zone observatories onto a common zero level. The AE index at any instant is AU minus AL. Fig. 2. Observatories whose records were used in the derivation of 1966 and 1967 AE(10) and 1968, 1969, 1970, 1971, 1972, 1973, 1974 AE(11) and 1975 AE(11-12) are shown as filled triangles. Their abbreviations correspond to the list given in Table 1. The map is a polar equal-area projection centered on the north geomagnetic pole (extended geocentric dipole axis). The north geographic pole is indicated by a star inscribed in a circle. Analysis of AE(11) index data for the years 1968 through 1970 suggests that an optimum station distribution would include locations just equatorward of the instantaneous auroral oval during the local evening hours which most often supplied AU (around 1800 LGT) and others directly under the oval during the early morning hours following Local Geomagnetic Midnight when most AL values are supplied (around 0300 LGT). [Note: LGT = Local Geomagnetic Time.] Computation of AE(11-12) Indices. The same technique of computation used for all prior AE derivations has been followed with the 1975 derivation. It is described in detail in Report UAG-22 [Allen, 1972]. A constant quiet-time H reference level was computed for each month for each station. It is the average of all 1.0-min H values for the 5 International Quiet Days of that station-month. The quiet-time reference values were then subtracted from the 1.0-min H scalings of each station and the 11 (or 12) resulting H-deviation time series were compared. At each 1.0-min data interval the extreme positive and negative H deviations were identified and designated AU(11) and AL(11) respectively. According to their definitions, AE(11) = AU(11) - AL(11) and AO(11) is the mean of AU(11) and AL(11). These are the basic AE data. In addition, hourly average values of each index were computed and simple statistical information was collected. Daily graphs of variations of all four 1.0-min indices (AU,AL,AE and AO) prepared from 35-mm microfilm are reproduced in this report in Section III. Also in Section III are monthly stacked plots of commonscale H (or X) component variations, of station frequency of AU and AL contribution, and of the cumulative (i.e. "total") amplitude of variations. Monthly summaries of hourly average values, daily averages, and hourly averages for special groups of days were prepared and are given in Section II. Also derived were tables showing the frequency of selection of each station for AU and AL and giving the times at which each station supplied the extreme deviations. These results are the basis for monthly sets of tables of stations supplying AU and AL for each hour. 2. Precautionary Notes Problems in Derived AE(11) Indices. Users of these indices should be aware of the following points that may affect the interpretation of index information contained in this report. Three potential sources of misleading or unreliable indices are (1) the working definition of AE used in the derivation of the indices, (2) the character of the magnetogram records and (3) the digitization and data manipulation processes. At an AE observatory an increased deviation from quiet-time H may be the same for either an enhanced electrojet current or for a constant current that moves closer to the fixed observatory location. Given a necessarily limited number of contributing observatories and an index based exclusively upon variations in the H component, it is not always possible to distinguish between these two alternatives. If an event is of sufficient magnitude and extent so as to be observed simultaneously at several locations or if it is of sufficient duration to be recorded by successive observatories rotating into the critical longitude sectors, then such ambiguity may be resolved. Effects of low-amplitude electrojet variations of short duration that occur during otherwise quiet intervals when the auroral oval is contracted may be imperfectly recorded. If such small events occur over sectors between widely separated observatories, they could be missed entirely, although past experience does not suggest that this happens frequently. Also, during very large magnetic disturbances, the auroral oval may expand equatorward below the ring of stations used to derive AE. Thus, times of low AE may not guarantee a total absence of magnetic activity over the polar cap, and during large magnetic storms, the indices are of questionable reliability. At the observatories, any problem that causes the H trace to be unstable or that causes loss of the record during disturbed times must inevitably affect the AE indices derived for such intervals. In general, periods of component drift at an observatory become relatively obvious when they reach an amplitude sufficient to obscure genuine variations recorded at other locations. Although efforts are made to salvage useful information during these intervals, sometimes the only solution has been elimination of that observatory's records until instrumental adjustments appear to have corrected the problem. A more serious problem arising from the character of the magnetograms is any time for which the H trace is effectively lost. This can occur because the trace moves off the recording paper in response to a large magnetic variation, poor recording of a rapidly moving trace, or confusion of multiple traces on a magnetogram. At such times, unless there exist back-up low sensitivity magnetograms from auxiliary systems at that location, the number of contributing stations is reduced. When the H trace is suddenly lost at a critically located station that was supplying either AU or AL, then some other station having the next most extreme H deviation at that instant begins to take the place of the lost data source and becomes the key to the affected index. Although such intervals are not usually noticeable in the graphs of AE variations, they commonly have the effect of producing a large bay-like feature in the affected AU or AL trace. An example of the effect of such data loss may be seen in the AU trace for 21 July 1970 (cf. Report UAG-22) beginning around 1330 UT. These characteristically-shaped spurious events have been dubbed "missing data effects" (mdes), and any suspected mdes in the 1975 graphs can best be checked by reference to the original magnetograms of the critical stations listed in Section II for those times. Sometimes our technique of selecting a constant quiet-day H reference level for each station-month of data may produce low-amplitude month-end discontinuities in AU or AL. Also, quiet-time departures of station values from their monthly average may produce intervals having elevated AU or AL values but appearing relatively quiet. Such index discontinuities and intervals of higher noise level are considered relatively insignificant compared to the amplitude of substorm effects to be seen in the indices. In spite of extensive quality control efforts, we expect that some errors will escape notice and be published or otherwise distributed. We request that anyone detecting questionable values in 1975 AE (11-12) or other AE indices please communicate with WDC-A for Solar-Terrestrial Physics concerning this matter. As necessary, corrections will be distributed to the user community on either a case-by-case basis or in future UAG Reports in this series. 3. Acknowledgments We continue to acknowledge the support, advice and assistance provided by A.H. Shapley and by the many scientist-users of these indices. AE indices are the result of an international cooperative effort involving observatories of six countries, the World Data Center system, and the staff of the National Geophysical and Solar-Terrestrial Data Center. In particular we wish to acknowledge the numerous scientists who have shared with us information concerning their uses of AE indices. 4. References ALLEN, J.H. 1972 Auroral Electrojet Magnetic Activity Indices (AE) for 1970 (Report UAG-22, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1973 Auroral Electrojet Magnetic Activity Indices AE(11) for 1968, (Report UAG-29, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1974a Auroral Electrojet Magnetic Activity Indices AE(11) for 1969, (Report UAG-31, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1974b Auroral Electrojet Magnetic Activity Indices AE(10) for 1967, (Report UAG-33, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1974c Auroral Electrojet Magnetic Activity Indices AE(10) for 1966, (Report UAG-37, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1975a Auroral Electrojet Magnetic Activity Indices AE(11) for 1971, (Report UAG-39, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1975b Auroral Electrojet Magnetic Activity Indices AE(11) for 1972, (Report UAG-45, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1975c Auroral Electrojet Magnetic Activity Indices AE(11) for 1973, (Report UAG-47, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1976 Auroral Electrojet Magnetic Activity Indices AE(11) for 1974, (Report UAG-59, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1977a Geomagnetic Data for January 1976 (AE(7) Indices and Stacked Magnetograms) (Report UAG-60, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1977b Geomagnetic Data for February 1976 (AE(7) Indices and Stacked Magnetograms) (Report UAG-62, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1977c Geomagnetic Data for March 1976 (AE(7) Indices and Stacked Magnetograms) (Report UAG-63, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). ALLEN, J.H., C.C. ABSTON and L.D. MORRIS 1977d Geomagnetic Data for April 1976 (AE(8) Indices and Stacked Magnetograms) (Report UAG-64, World Data Center A for Solar-Terrestrial Physics, Boulder, Colorado 80303). DAVIS, T.N. and M. SUGIURA 1966 Auroral Electrojet Activity Index AE and Its Universal Time Variations, *J. Geophys. Res.* 71, 785-801. SECTION II. TABLES 1. Explanation Table of Monthly Quiet-Time H Reference Values. The monthly quiet-time H reference values are given for each observatory in Table 2. These values are the base from which H deviations were derived and they are computed as the average of all 1.0-min digitized H values from the internationally adopted 5 Quiet Days for each month. The given values are in nanoTesla units and are absolute in the sense that they include the applied scale value and provisional baseline used for each observatory's magnetograms. Although subsequent changes in adopted baselines may shift the reference values slightly, they should not affect the derived indices because the method of derivation eliminates the H baseline provided it is constant for the month. Tables of Hourly Mean Indices. These tables contain monthly listings of average hourly indices for each day: AE, AL, AU and AO. These hourly values were computed as the mean of the 1.0-min instantaneous values. The first hour of each day covers the data interval from 0000-0059 UT. All times are given in Universal Time and the indices are given in nanoTeslas. AE is always positive and although AU is positive most of the time, it may become negative during the main phase period of large storms when H is depressed globally by an enhanced ring current. Sometimes AU may briefly become negative as a result of missing data effects (See Section I-2). AL is almost always negative, and during most substorm events, it will exceed AU in absolute value. Consequently, AO is usually negative, and it provides a measure of the unequal amplitude of AU and AL effects. Tables of Observatories Supplying Hourly AU and AL. As described above, the hourly average indices are computed from the 1.0-min instantaneous indices derived for that hour. Each pair of instantaneous values of AU and AL arises from H deviations at only two stations and the station pair contributing these extremes may change from one 1.0-min interval to the next. To associate a single station with values of hourly AU or AL some convention must be adopted as a basis for selection. We have chosen to designate the station having the maximum average H deviation during an hour as the source of hourly AU. Likewise, the station having the most negative H deviation is designated as the source of hourly AL. Within a disturbed hour it is common for one station pair to be the most frequent contributors of AU and AL and also to provide the greatest average deviations in H. There are times, however, when this does not hold. This is the case during an hour that is quiet until near the end or one that has only its first few values disturbed. Here the table will list the stations that provided AU and AL for the short disturbed portion of the hour rather than those stations providing AU and AL for the longer undisturbed portion of the hour. In effect, the listed station pairs are the same stations that would have supplied AU and AL had the indices been derived from hourly scalings of H instead of from averages of 1.0-min values. These tables serve to illustrate the nonuniform frequency of contribution of AU and AL for different stations of the network. They also illustrate the systematic grouping in Universal Time of the time of most frequent station contribution of AU and AL. Graphs corresponding to these tables are found in Section III-3. Table 2. Monthly Quiet-Time H Reference Values (Units: Gammas = nT) | Observatory Name | Year | Jan | Feb | Mar | Apr | May | Jun | |----------------------|------|-------|-------|-------|-------|-------|-------| | 1. Leirvogur | 1975 | 12300 | 12301 | 12305 | 12310 | 12316 | 12327 | | 2. Narssarssuaq | 1975 | 11890 | 11884 | 11905 | 11908 | 11918 | 11929 | | 3. Great Whale River | 1975 | 9696 | 9706 | 9707 | 9719 | 9734 | 9746 | | 4. Fort Churchill | 1975 | 7273 | 7271 | 7296 | 7294 | 7292 | 7300 | | 5. Yellowknife | 1975 | 7572 | 7541 | 7569 | 7578 | 7577 | 7581 | | 6. College | 1975 | 13042 | 13038 | 13112 | 13043 | 13040 | 13046 | | 7. Barrow | 1975 | | | | | | 9851 | | 8. Cape Wellen | 1975 | 14248 | 14248 | 14251 | 14254 | 14251 | 14254 | | 9. Tixie Bay | 1975 | 7919 | 7921 | 7925 | 7914 | 7914 | 7921 | | 10. Cape Chelyuskin | 1975 | 3519 | 3526 | 3523 | 3532 | 3521 | 3531 | | 11. Dixon Island | 1975 | 6494 | 6496 | 6504 | 6508 | 6502 | 6497 | | 12. Abisko | 1975 | 11816 | 11812 | 11816 | 11819 | 11821 | 11825 | 3. TABLES OF HOURLY AVERAGE AE INDICES | JANUARY | 1975 | |---------|------| | UT | 1 | | Q | 01 | | D | 06 | | Q | 11 | | D | 16 | | Q | 21 | | D | 26 | VALUES ARE EXPRESSED IN GAMMAS | AE INDICES | |------------| | 01 | | 02 | | 03 | | 04 | | 05 | | 06 | | 07 | | 08 | | 09 | | 10 | | 11 | | 12 | | 13 | | 14 | | 15 | | 16 | | 17 | | 18 | | 19 | | 20 | | 21 | | 22 | | 23 | | 24 | | 25 | | MEAN | | SQ MEAN | | 5D MEAN | MEAN | March | UT | AE Indices | |-------|----|-----------| | 1975 | | | | | 1 | 2 | | | 3 | 4 | | | 5 | 6 | | | 7 | 8 | | | 9 | 10 | | | 11 | 12 | | | 13 | 14 | | | 15 | 16 | | | 17 | 18 | | | 19 | 20 | | | 21 | 22 | | | 23 | 24 | | | MEAN | | Values are expressed in gammas. | March | UT | Values | |-------|----|--------| | 1975 | | | | | 1 | 2 | | | 3 | 4 | | | 5 | 6 | | | 7 | 8 | | | 9 | 10 | | | 11 | 12 | | | 13 | 14 | | | 15 | 16 | | | 17 | 18 | | | 19 | 20 | | | 21 | 22 | | | 23 | 24 | | | MEAN | | 5Q MEAN | 435 466 579 5D MEAN | 466 579 467 MEAN | 225 233 251 232 185 201 236 277 293 283 310 373 347 334 308 338 349 353 320 305 265 243 268 260 283 | UT | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----| | D 01 | 314 | 215 | 597 | 502 | 233 | 231 | 467 | 365 | 341 | 500 | 197 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | | D 02 | 597 | 503 | 918 | 132 | 243 | 271 | 458 | 383 | 278 | 104 | 055 | 207 | 350 | 207 | 156 | 156 | 145 | 195 | 096 | 062 | 077 | 072 | 054 | 061 | | D 03 | 233 | 231 | 467 | 365 | 341 | 500 | 197 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | | D 04 | 467 | 365 | 341 | 500 | 197 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 05 | 365 | 341 | 500 | 197 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 06 | 341 | 500 | 197 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 07 | 500 | 197 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 08 | 197 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 09 | 333 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 10 | 512 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 11 | 459 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 12 | 333 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 13 | 294 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 14 | 173 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 15 | 075 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 16 | 078 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 17 | 086 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 18 | 186 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 19 | 144 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 20 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 21 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 22 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 23 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 24 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 25 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 26 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 27 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 28 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 29 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 30 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | | D 31 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | 136 | Values are expressed in gammas. | JANUARY | 1975 | |---------|------| | UT | 1 | | | 2 | | | 3 | | | 4 | | | 5 | | | 6 | | | 7 | | | 8 | | | 9 | | | 10 | | | 11 | | | 12 | | | 13 | | | 14 | | | 15 | | | 16 | | | 17 | | | 18 | | | 19 | | | 20 | | | 21 | | | 22 | | | 23 | | | 24 | | AL INDICES | VALUES ARE EXPRESSED IN GAMMAS | | Q 01 | -0.133 | | Q 02 | -0.021 | | Q 03 | -0.014 | | Q 04 | -0.025 | | Q 05 | -0.012 | | Q 06 | -0.017 | | Q 07 | -0.051 | | Q 08 | -0.010 | | Q 09 | -0.043 | | Q 10 | -0.024 | | Q 11 | -0.048 | | Q 12 | -0.039 | | Q 13 | -0.026 | | Q 14 | -0.130 | | Q 15 | -0.365 | | Q 16 | -0.216 | | Q 17 | -0.338 | | Q 18 | -0.069 | | Q 19 | -0.037 | | Q 20 | -0.057 | | Q 21 | -0.005 | | Q 22 | -0.070 | | Q 23 | -0.023 | | Q 24 | -0.149 | | Q 25 | -0.005 | | Q 26 | -1.04 | | Q 27 | -0.004 | | Q 28 | -1.172 | | Q 29 | -0.011 | | Q 30 | -0.034 | | Q 31 | -0.046 | | MEAN | -0.123 | | 5Q MEAN | -0.043 | | 5D MEAN | -0.254 | MEAN = -0.123 5Q MEAN = -0.043 5D MEAN = -0.254 | UT | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----| | D | 01 | -064 | -125 | -230 | -366 | -439 | -375 | -147 | -107 | -256 | -203 | -334 | -691 | -679 | -511 | -413 | -697 | -511 | -413 | -697 | -511 | -413 | -697 | -511 | -413 | | | 02 | -343 | -197 | -290 | -243 | -051 | -116 | -148 | -025 | -017 | -086 | -448 | -331 | -337 | -305 | -277 | -174 | -300 | -089 | -050 | -031 | -212 | -356 | -231 | | | 03 | -055 | -064 | -097 | -247 | -235 | -014 | -081 | -046 | -002 | -005 | -010 | -041 | -169 | -225 | -175 | -157 | -277 | -157 | -073 | -143 | -374 | -058 | -018 | -033 | | | 04 | -123 | -024 | -058 | -083 | -157 | -033 | -039 | -113 | -120 | -138 | -121 | -398 | -518 | -221 | -037 | -091 | -333 | -587 | -211 | -087 | -132 | -222 | -100 | -081 | | | 05 | -211 | -086 | -157 | -033 | -039 | -113 | -120 | -138 | -121 | -398 | -518 | -221 | -037 | -091 | -333 | -587 | -211 | -087 | -132 | -222 | -100 | -081 | -180 | | Q | 06 | -112 | -095 | -086 | -061 | -120 | -021 | -002 | -066 | -204 | -158 | -059 | -009 | -002 | -029 | -067 | -067 | -069 | -130 | -108 | -101 | -086 | -026 | -030 | -074 | | | 07 | -097 | -037 | -192 | -107 | -096 | -199 | -174 | -086 | -044 | -281 | -280 | -247 | -284 | -257 | -167 | -114 | -447 | -594 | -388 | -089 | -119 | -119 | -175 | -025 | | | 08 | -079 | -064 | -078 | -167 | -168 | -156 | -047 | -063 | -151 | -075 | -035 | -032 | -023 | -011 | -014 | -119 | -014 | -017 | -070 | -003 | -011 | -017 | -070 | -003 | | | 09 | -044 | -282 | -285 | -083 | -104 | -131 | -104 | -014 | -003 | -003 | -004 | -006 | -005 | -006 | -003 | -032 | -116 | -146 | -058 | -070 | -013 | -081 | -155 | -308 | | | 10 | -205 | -241 | -067 | -149 | -274 | -358 | -300 | -253 | -117 | -029 | 000 | -094 | -301 | -145 | -488 | -344 | -311 | -592 | -134 | -050 | -090 | -829 | -453 | -245 | | D | 11 | -243 | -705 | -507 | -195 | -202 | -130 | -154 | -092 | -039 | -038 | -166 | -253 | -282 | -140 | -232 | -479 | -410 | -553 | -511 | -387 | -400 | -783 | -429 | -315 | | | 12 | -252 | -372 | -213 | -231 | -127 | -159 | -341 | -277 | -394 | -139 | -379 | -551 | -277 | -417 | -330 | -092 | -644 | -792 | -329 | -165 | -426 | -480 | -295 | -262 | | | 13 | -344 | -337 | -198 | -172 | -133 | -114 | -011 | -076 | -011 | -114 | -094 | -167 | -339 | -312 | -437 | -204 | -121 | -483 | -437 | -322 | -545 | -368 | -184 | -224 | | | 14 | -435 | -210 | -207 | -114 | -134 | -026 | -054 | -312 | -301 | -027 | -433 | -301 | -041 | -026 | -176 | -524 | -271 | -255 | -403 | -422 | -213 | -226 | -302 | | | 15 | -260 | -115 | -046 | -022 | -127 | -204 | -137 | -221 | -084 | -015 | -053 | -114 | -220 | -273 | -460 | -205 | -184 | -372 | -209 | -399 | -147 | -128 | -524 | | | 16 | -263 | -184 | -066 | -034 | -036 | -065 | -142 | -261 | -061 | -085 | -258 | -480 | -213 | -076 | -256 | -500 | -499 | -646 | -733 | -733 | -221 | -055 | -124 | -203 | | | 17 | -106 | -055 | -031 | -104 | -226 | -261 | -092 | -025 | -017 | -028 | -197 | -227 | -135 | -210 | -119 | -056 | -155 | -212 | -328 | -366 | -164 | -164 | -206 | -114 | | | 18 | -225 | -291 | -272 | -112 | -138 | -081 | -138 | -229 | -277 | -286 | -141 | -001 | -002 | 002 | 002 | 003 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | | | 19 | -089 | -004 | -008 | -016 | -172 | -109 | -109 | -081 | -138 | -229 | -277 | -286 | -141 | -001 | -002 | 002 | 003 | 000 | 000 | 000 | 000 | 000 | 000 | | | 20 | -196 | -020 | -020 | -041 | -022 | -007 | -003 | -039 | -150 | -215 | -117 | -001 | -002 | 002 | 003 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | 000 | | MEAN| -076 | -009 | -011 | -047 | -102 | -081 | -041 | -048 | -108 | -047 | -064 | -058 | -036 | -036 | -044 | -072 | -096 | -056 | -089 | -194 | -157 | -007 | -007 | -013 | -063 | | | 022 | -026 | -100 | -169 | -088 | -000 | -001 | -000 | -012 | -064 | -063 | -106 | -063 | -106 | -063 | -106 | -063 | -106 | -063 | -106 | -063 | -106 | -063 | -106 | -063 | | D | 23 | -049 | -182 | -127 | -007 | -022 | -048 | -248 | -089 | -048 | -252 | -422 | -1131 | -387 | -107 | -339 | -739 | -614 | -354 | -096 | -034 | -012 | -027 | -058 | -257 | | | 24 | -202 | -271 | -311 | -092 | -046 | -006 | -009 | -009 | -016 | -020 | -024 | -016 | -296 | -375 | -219 | -288 | -440 | -137 | -066 | -114 | -144 | -247 | -106 | -078 | | | 25 | -102 | -119 | -276 | -192 | -207 | -460 | -346 | -082 | -210 | -182 | -186 | -260 | -414 | -494 | -168 | -115 | -238 | -061 | -058 | -024 | -017 | -067 | -090 | -147 | | Q | 26 | -096 | -053 | -158 | -145 | -009 | -012 | -018 | -079 | -042 | -038 | -050 | -092 | -103 | -136 | -190 | -023 | -008 | -003 | -008 | -010 | -038 | -098 | -076 | | | 27 | -005 | -001 | -005 | -001 | -022 | -159 | -155 | -057 | -016 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | -013 | | | 28 | -031 | -045 | -045 | -102 | -110 | -026 | -060 | -030 | -255 | -134 | -043 | -009 | -009 | -009 | -009 | -009 | -009 | -009 | -009 | -009 | -009 | -009 | -009 | | MEAN| -158 | -153 | -117 | -118 | -131 | -135 | -097 | -107 | -108 | -140 | -229 | -210 | -174 | -185 | -178 | -227 | -287 | -211 | -148 | -154 | -190 | -158 | -173 | -164 | | $0$ MEAN| -084 | -056 | -072 | -071 | -062 | -066 | -058 | -106 | -099 | -061 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | -063 | | $50$ MEAN| -163 | -325 | -229 | -190 | -213 | -214 | -237 | -164 | -171 | -132 | -260 | -584 | -385 | -264 | -360 | -372 | -478 | -598 | -354 | -173 | -233 | -290 | -298 | -298 | | UT | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----| | 01 | -189 | -090 | -025 | -019 | -041 | -020 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | | 02 | -043 | -056 | -068 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | -056 | | 03 | -122 | -247 | -156 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | -124 | | 04 | -030 | -124 | -130 | -089 | -008 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | -023 | | 05 | -293 | -183 | -040 | -047 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | -021 | | 06 | -072 | -226 | -096 | -080 | -068 | -131 | -096 | -067 | -135 | -149 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | -061 | | 07 | -065 | -077 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | | D 08 | -247 | -258 | -226 | -206 | -101 | -182 | -290 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | -327 | | D 09 | -294 | -562 | -732 | -526 | -651 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | -433 | | D 10 | -450 | -294 | -574 | -749 | -596 | -215 | -237 | -298 | -455 | -455 | -237 | -298 | -455 | -455 | -237 | -298 | -455 | -455 | -237 | -298 | -455 | -455 | -237 | -298 | | D 11 | -119 | -661 | -446 | -264 | -435 | -455 | -410 | -196 | -251 | -444 | -132 | -542 | -495 | -270 | -106 | -125 | -107 | -145 | -132 | -542 | -495 | -270 | -106 | -125 | | D 12 | -70 | -106 | -125 | -107 | -145 | -132 | -542 | -495 | -270 | -106 | -125 | -107 | -145 | -132 | -542 | -495 | -270 | -106 | -125 | -107 | -145 | -132 | -542 | -495 | | D 13 | -701 | -637 | -266 | -202 | -285 | -193 | -250 | -664 | -242 | -027 | -106 | -148 | -353 | -050 | -024 | -014 | -027 | -106 | -148 | -353 | -050 | -024 | -014 | -027 | | D 14 | -291 | -583 | -539 | -551 | -444 | -333 | -331 | -048 | -022 | -083 | -172 | -111 | -123 | -163 | -212 | -188 | -154 | -095 | -104 | -230 | -200 | -075 | -171 | -225 | | D 15 | -073 | -071 | -124 | -034 | -081 | -087 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | -027 | | 16 | -203 | -195 | -063 | -105 | -090 | -022 | -054 | -061 | -095 | -025 | -085 | -016 | -016 | -016 | -016 | -016 | -016 | -016 | -016 | -016 | -016 | -016 | -016 | -016 | | Q 17 | -022 | -041 | -086 | -050 | -019 | -022 | -024 | -021 | -042 | -160 | -130 | -043 | -043 | -043 | -043 | -043 | -043 | -043 | -043 | -043 | -043 | -043 | -043 | -043 | | Q 18 | -013 | -014 | -014 | -020 | -014 | -017 | -019 | -029 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | -036 | | Q 19 | -143 | -060 | -023 | -010 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | -012 | | Q 20 | -013 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | | 21 | -353 | -357 | -464 | -110 | -023 | -012 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | -010 | | 22 | -117 | -236 | -085 | -039 | -127 | -352 | -316 | -243 | -164 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | -047 | | 23 | -102 | -376 | -321 | -117 | -163 | -241 | -279 | -171 | -304 | -135 | -815 | -236 | -124 | -088 | -088 | -088 | -088 | -088 | -088 | -088 | -088 | -088 | -088 | -088 | | 24 | -486 | -366 | -252 | -275 | -159 | -116 | -214 | -307 | -095 | -099 | -519 | -121 | -068 | -068 | -068 | -068 | -068 | -068 | -068 | -068 | -068 | -068 | -068 | -068 | | 25 | -132 | -137 | -033 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | -073 | | 26 | -458 | -225 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | -038 | | Q 27 | -029 | -022 | -026 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | -018 | | Q 28 | -028 | -141 | -066 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | -017 | | Q 29 | -018 | -026 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | -019 | | 30 | -016 | -018 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | -022 | | MEAN | -179 | -213 | -170 | -143 | -151 | -120 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | -128 | | 5G MEAN | -048 | -058 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | -045 | | 5D MEAN | -378 | -482 | -448 | -389 | -414 | -350 | -337 | -261 | -350 | -337 | -261 | -350 | -337 | -261 | -350 | -337 | -261 | -350 | -337 | -261 | -350 | -337 | -261 | -350 | VALUES ARE EXPRESSED IN GAMMAS MEAN | UT | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----| | D | -211 | -144 | -062 | -045 | -019 | -052 | -101 | -069 | -035 | -053 | -101 | -128 | -208 | -396 | -211 | -234 | -182 | -146 | -352 | -098 | -035 | -117 | -122 | -285 | -141 | | Q | -413 | -308 | -342 | -256 | -482 | -389 | -086 | -309 | -567 | -409 | -058 | -087 | -108 | -262 | -338 | -259 | -371 | -167 | -175 | -371 | -187 | -144 | -272 | -72 | | 0 | -166 | -140 | -141 | -070 | -078 | -119 | -261 | -326 | -311 | -198 | -166 | -173 | -118 | -058 | -098 | -186 | -158 | -201 | -124 | -158 | -158 | -124 | -162 | | 1 | -237 | -250 | -333 | -147 | -154 | -367 | -248 | -192 | -163 | -125 | -104 | -112 | -103 | -055 | -055 | -141 | -162 | -270 | -148 | -274 | -303 | -100 | -097 | -285 | -161 | | 2 | -452 | -254 | -141 | -118 | -164 | -053 | -017 | -092 | -052 | -024 | -031 | -173 | -055 | -141 | -162 | -270 | -148 | -274 | -303 | -100 | -097 | -285 | -161 | | 3 | -163 | -250 | -331 | -312 | -172 | -157 | -105 | -055 | -133 | -069 | -018 | -027 | -042 | -060 | -275 | -281 | -190 | -198 | -272 | -095 | -024 | -024 | -065 | -089 | -149 | | 4 | -175 | -077 | -040 | -076 | -145 | -131 | -189 | -228 | -286 | -084 | -059 | -047 | -024 | -019 | -023 | -024 | -026 | -021 | -031 | -039 | -164 | -024 | -254 | -062 | -032 | -093 | | 5 | -034 | -041 | -032 | -031 | -035 | -030 | -072 | -070 | -043 | -052 | -073 | -052 | -064 | -165 | -195 | -109 | -016 | -007 | -012 | -022 | -040 | -055 | -084 | -080 | -059 | | 6 | -038 | -037 | -082 | -082 | -298 | -106 | -030 | -024 | -026 | -095 | -114 | -059 | -119 | -101 | -146 | -182 | -093 | -082 | -054 | -048 | -059 | -055 | -101 | -114 | -081 | | 7 | -042 | -118 | -083 | -079 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | -059 | | 8 | -192 | -157 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | -121 | | 9 | -080 | -223 | -271 | -406 | -168 | -045 | -168 | -106 | -148 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | -174 | | 10 | -133 | -376 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | -148 | | 11 | -069 | -069 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | -081 | | 12 | -027 | -059 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | -131 | | 13 | -338 | -166 | -220 | -296 | -193 | -120 | -307 | -217 | -205 | -205 | -380 | -505 | -348 | -159 | -178 | -343 | -428 | -204 | -309 | -252 | -105 | -057 | -131 | -338 | -132 | -247 | | 14 | -046 | -075 | -108 | -087 | -032 | -029 | -165 | -122 | -198 | -351 | -276 | -137 | -134 | -106 | -122 | -124 | -270 | -105 | -149 | -295 | -212 | -255 | -159 | | 15 | -379 | -298 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | -296 | | 16 | -037 | -074 | -110 | -060 | -017 | -022 | -022 | -055 | -064 | -102 | -075 | -061 | -083 | -149 | -032 | -033 | -039 | -036 | -105 | -142 | -036 | -105 | -068 | -043 | -067 | | 17 | -049 | -038 | -274 | -331 | -110 | -027 | -021 | -063 | -244 | -331 | -180 | -088 | -086 | -086 | -054 | -027 | -051 | -127 | -384 | -272 | -046 | -077 | -313 | -177 | -202 | -152 | | 18 | -123 | -097 | -042 | -046 | -076 | -076 | -058 | -092 | -256 | -204 | -171 | -144 | -062 | -102 | -063 | -025 | -012 | -011 | -009 | -032 | -084 | -075 | -029 | -042 | -001 | | 19 | -056 | -021 | -025 | -020 | -100 | -094 | -042 | -029 | -023 | -022 | -018 | -025 | -069 | -052 | -036 | -035 | -076 | -022 | -034 | -047 | -077 | -019 | -019 | -019 | -019 | | 20 | -032 | -051 | -142 | -039 | -039 | -014 | -014 | -017 | -019 | -023 | -032 | -023 | -013 | -006 | -014 | -012 | -008 | -000 | -003 | -006 | -012 | -002 | -029 | -034 | -030 | -025 | | 21 | -029 | -028 | -025 | -016 | -017 | -020 | -019 | -021 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | -031 | | 22 | -188 | -243 | -208 | -090 | -285 | -092 | -043 | -051 | -157 | -116 | -029 | -063 | -171 | -104 | -027 | -045 | -082 | -020 | -015 | -030 | -050 | -022 | -024 | -091 | | 23 | -023 | -025 | -023 | -018 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | -032 | | 24 | -067 | -040 | -021 | -019 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | -007 | | 25 | -026 | -024 | -068 | -063 | -036 | -036 | -097 | -237 | -045 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | -024 | | 26 | -363 | -462 | -409 | -225 | -225 | -145 | -103 | -347 | -310 | -181 | -354 | -258 | -176 | -075 | -075 | -075 | -075 | -075 | -075 | -075 | -075 | -075 | -075 | -075 | -075 | | MEAN | -146 | -149 | -126 | -122 | -122 | -131 | -142 | -162 | -162 | -135 | -118 | -147 | -134 | -134 | -134 | -134 | -134 | -134 | -134 | -134 | -134 | -134 | -134 | -134 | -134 | | 5Q MEAN | -037 | -051 | -061 | -037 | -048 | -053 | -034 | -037 | -047 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | -041 | | 5D MEAN | -219 | -232 | -230 | -199 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | -189 | Values are expressed in gammas. ## Tables of Hourly Average AU Indices ### Values are expressed in gammas | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| | 1975 | January | | | | #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### SD Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 50% Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| #### 5D Mean | Year | Month | Day | UT | AU Indices | |------|-------|-----|----|------------| | MARCH | UT | 1975 | AU INDICES | VALUES ARE EXPRESSED IN GAMMAS | MEAN | |-------|----|------|------------|--------------------------------|------| | | | | | | | | 01 | 040| 106 | 029 | 046 | 080 | | 02 | 051| 085 | 058 | 053 | 045 | | 03 | 041| 027 | 023 | 039 | 039 | | 04 | 048| 069 | 067 | 064 | 042 | | 05 | 057| 090 | 090 | 060 | 135 | | 06 | 087| 074 | 051 | 037 | 110 | | Q | 07 | 026 | 019 | 006 | 011 | | Q | 08 | 014 | 006 | 010 | 011 | | Q | 09 | 010 | 010 | 010 | 027 | | D | 10 | 049 | 181 | 216 | 135 | | 011 | 137| 259 | 159 | 149 | 143 | | D | 12 | 103 | 054 | 032 | 143 | | D | 13 | 055 | 009 | 060 | 098 | | D | 14 | 044 | 044 | 021 | 101 | | D | 15 | 104 | 106 | 090 | 099 | | 016 | 071| 077 | 059 | 065 | 101 | | 017 | 098| 086 | 106 | 063 | 075 | | 018 | 115| 144 | 108 | 040 | 116 | | 019 | 100| 077 | 100 | 073 | 086 | | 020 | 105| 044 | 044 | 044 | 086 | | 021 | 043| 033 | 036 | 019 | 036 | | 022 | 014| 014 | 012 | 009 | 019 | | 023 | 079| 070 | 082 | 129 | 112 | | 024 | 015| 015 | 031 | 031 | 103 | | 025 | 020| 020 | 049 | 049 | 068 | | 026 | 014| 023 | 038 | 035 | 078 | | 027 | 075| 074 | 098 | 065 | 112 | | 028 | 054| 049 | 046 | 045 | 103 | | 029 | 040| 063 | 078 | 057 | 092 | | 030 | 067| 040 | 044 | 055 | 049 | | 031 | 095| 101 | 055 | 061 | 068 | | MEAN | 056| 063 | 065 | 055 | 081 | | SQ MEAN| 023| 025 | 022 | 020 | 018 | | SD MEAN| 059| 099 | 130 | 102 | 135 | Values expressed in gammas: - Mean: 0.080 - Standard deviation: 0.045 Values are expressed in gammas: - Mean: 0.080 - Standard deviation: 0.045 ### TABLES OF HOURLY AVERAGE AO INDICES | JANUARY | 1975 | |---------|------| | UT | 1 | | | 2 | | | 3 | | | 4 | | | 5 | | | 6 | | | 7 | | | 8 | | | 9 | | | 10 | | | 11 | | | 12 | | | 13 | | | 14 | | | 15 | | | 16 | | | 17 | | | 18 | | | 19 | | | 20 | | | 21 | | | 22 | | | 23 | | | 24 | **AO INDICES** VALUES ARE EXPRESSED IN GAMMAS MEAN ### AO Indices | UT | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | MEAN | |----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----| | 01 | -0.097 | -0.026 | -0.004 | -0.002 | -0.013 | -0.003 | -0.020 | -0.029 | -0.098 | -0.025 | -0.029 | -0.013 | 0.000 | -0.032 | -0.002 | -0.055 | 0.004 | -0.003 | 0.000 | -0.002 | 0.005 | -0.004 | -0.024 | | 02 | -0.012 | -0.018 | -0.026 | -0.021 | 0.003 | -0.001 | -0.006 | -0.009 | -0.009 | -0.006 | -0.008 | -0.010 | -0.009 | -0.007 | -0.012 | -0.012 | -0.010 | -0.025 | -0.031 | 0.011 | -0.010 | | 03 | -0.024 | -0.102 | -0.055 | -0.030 | -0.002 | 0.000 | -0.003 | -0.043 | -0.030 | 0.005 | 0.005 | -0.006 | -0.004 | -0.017 | 0.000 | 0.000 | -0.032 | -0.046 | 0.004 | -0.003 | -0.017 | | 04 | -0.002 | -0.049 | -0.036 | -0.102 | -0.041 | 0.006 | -0.003 | -0.001 | -0.012 | -0.035 | 0.026 | 0.025 | 0.005 | -0.006 | 0.007 | -0.017 | -0.026 | -0.003 | -0.018 | 0.004 | -0.062 | -0.007 | | 05 | -0.127 | -0.062 | 0.009 | -0.002 | -0.001 | -0.007 | -0.007 | -0.009 | -0.009 | -0.009 | 0.005 | 0.007 | 0.014 | -0.004 | -0.003 | -0.005 | 0.001 | -0.001 | -0.059 | -0.038 | -0.009 | 0.020 | -0.043 | -0.048 | -0.010 | -0.020 | | 06 | 0.004 | -0.099 | -0.027 | -0.018 | -0.027 | -0.057 | -0.026 | -0.006 | -0.001 | 0.001 | 0.027 | 0.021 | 0.001 | -0.003 | -0.003 | -0.006 | -0.068 | -0.059 | -0.016 | 0.009 | 0.015 | 0.030 | -1.46 | -0.020 | 0.021 | -0.019 | | 07 | 0.002 | -0.020 | 0.009 | -0.009 | -0.011 | 0.010 | -0.023 | 0.001 | 0.008 | 0.010 | -1.08 | -1.45 | 0.021 | 0.016 | 0.018 | 0.009 | 0.032 | -1.31 | -0.058 | 0.009 | 0.015 | -0.055 | -2.04 | -1.77 | -0.091 | -0.041 | | 08 | -0.077 | -1.099 | -0.068 | -0.035 | -0.019 | -0.048 | -1.03 | -0.123 | -0.033 | -0.163 | -0.179 | -1.57 | -1.58 | -1.50 | -0.038 | -0.072 | -0.058 | -0.098 | -0.058 | 0.009 | 0.008 | -0.012 | -0.073 | | 09 | -1.224 | -2.53 | -3.02 | -1.33 | -2.42 | -1.94 | -2.95 | -2.07 | 0.009 | -0.064 | -0.086 | -1.40 | -1.39 | -0.078 | 0.030 | 0.013 | -0.007 | -0.054 | -0.016 | -0.035 | -0.041 | 0.010 | -0.095 | -0.273 | -0.036 | -0.092 | | 10 | -2.26 | -0.999 | -1.94 | -2.95 | -2.07 | 0.009 | -0.064 | -0.086 | -1.40 | -1.39 | -0.078 | 0.030 | 0.013 | -0.007 | -0.054 | -0.016 | -0.035 | -0.041 | 0.010 | -0.095 | -0.273 | -0.036 | -0.092 | | 11 | -0.004 | -3.00 | -1.81 | -0.97 | -0.162 | -1.80 | -1.54 | -0.36 | -0.067 | -1.25 | -1.81 | -3.66 | -2.50 | -0.15 | -0.064 | -1.62 | -0.060 | -0.005 | -0.042 | -0.033 | 0.005 | -0.026 | -0.077 | -1.04 | -1.12 | | 12 | -0.032 | -0.004 | -0.07 | -0.016 | -0.047 | -0.021 | -0.122 | -0.052 | -0.017 | -0.163 | -1.27 | -0.82 | -0.082 | -0.13 | -0.085 | -0.085 | -0.023 | -0.081 | -0.035 | 0.000 | -1.85 | -3.75 | -2.69 | -0.888 | | 13 | -3.72 | -2.60 | -0.41 | -0.050 | -0.106 | -0.067 | -0.75 | -0.232 | -0.068 | 0.036 | -0.09 | -0.017 | -0.038 | -0.021 | -0.038 | 0.006 | 0.012 | 0.019 | -0.014 | -0.050 | -0.079 | -0.058 | -0.077 | -1.68 | -1.68 | | 14 | -0.94 | -2.44 | -2.49 | -2.78 | -1.55 | -1.19 | -1.35 | -0.007 | 0.006 | -0.047 | -0.017 | -0.019 | -0.018 | -0.035 | -0.063 | -0.064 | -0.021 | -0.010 | -0.052 | -0.019 | 0.007 | -0.048 | -0.058 | -0.073 | | 15 | -0.014 | -0.002 | -0.044 | -0.003 | -0.027 | -0.036 | -0.003 | -0.003 | -0.002 | 0.010 | -0.001 | -0.016 | -0.013 | -0.013 | -0.066 | -0.074 | -0.024 | 0.076 | -0.033 | 0.011 | -0.004 | 0.000 | -0.003 | -0.026 | -0.021 | **MEAN** -0.059 | -0.078 | -0.055 | -0.045 | -0.052 | -0.034 | -0.038 | -0.026 | -0.027 | -0.041 | -0.026 | -0.030 | -0.028 | -0.030 | -0.038 | -0.042 | -0.049 | -0.059 | -0.049 | -0.034 | -0.029 | -0.038 | -0.042 | -0.040 | **SQ MEAN** -0.002 | -0.007 | -0.003 | -0.007 | -0.012 | -0.002 | -0.003 | -0.012 | -0.024 | 0.004 | 0.000 | 0.004 | 0.005 | 0.005 | 0.001 | -0.002 | 0.002 | 0.005 | 0.009 | 0.004 | 0.000 | 0.007 | 0.008 | 0.006 | 0.004 | -0.003 **5D MEAN** -1.61 | -2.04 | -1.57 | -1.22 | -1.47 | -0.76 | -0.77 | -0.94 | -0.65 | -0.91 | -0.86 | -1.28 | -1.09 | -1.28 | -0.86 | -0.93 | -0.63 | -0.93 | -1.28 | -0.86 | -0.78 | -0.76 | -0.99 | -1.02 | -0.78 | -0.76 | -0.99 | -1.02 | Location | Geomagnetic | Idenitification | Geomagnetic | |----------|-------------|-----------------|-------------| | Yek North | AI = Abisko | | | | Yek North | Bw Barrow | | | | NASC | GWR Great Whale R. 55 16.0 -77 43.0 | | THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH. | | College | GR = College | | | | NASC | AS Sea Ice Bay | | | | NASC | CAPE Hellen | | | | NASC | AMO IZDO I | | | *"NASA" is the maximum percent of the mean value (AU). | JANUARY | 1975 | |---------|------| | UT | 01 | | | 02 | | | 03 | | | 04 | | | 05 | | | 06 | | | 07 | | | 08 | | | 09 | | | 10 | | | 11 | | | 12 | | | 13 | | | 14 | | | 15 | | | 16 | | | 17 | | | 18 | | | 19 | | | 20 | | | 21 | | | 22 | | | 23 | | | 24 | | | 25 | | | 26 | | | 27 | | | 28 | | | 29 | | | 30 | | | 31 | **TABLE OF OBSERVATORIES SUPPLYING HOURLY AL BASED ON MEAN VALUE** AL = MINIMUM DELTA H | IDENTIFICATION | GEOGRAPHIC | GEOMAGNETIC | IDENTIFICATION | |----------------|------------|-------------|----------------| | AI | ABISKO | LONG | LAT | | BW | BARROW | LONG | LAT | | CC | CHELYUSKIN | LONG | LAT | | CO | COLLEGE | LONG | LAT | | GWR | GREAT WHALE R. | LONG | LAT | | DI | DIXON ISLAND | LONG | LAT | *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH.* AI = FT. CHURCHILL BW = LEIRVOGUR CC = NARSSARSSUAQ CO = TIXIE BAY GWR = CAPE WELLEN DI = YELLOWKNIFE * THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH. ### TABLE OF OBSERVATORIES SUPPLYING HOURLY AU BASED ON MEAN VALUE **FEBRUARY 1975** | UT | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----| | D1 | YEK YEK YEK CO CO CO CC LR DI DI AI AI AI AI NAS FC LR FC FC YEK YEK | | 2 | FC YEK YEK CO YEK YEK CC CO YEK DI DI DI AI NAS NAS NAS AI AI NAS YEK NAS FC YEK | | 3 | YEK FC YEK YEK YEK YEK CC CO CC CC CC DI DI DI LR NAS NAS NAS DI YEK YEK NAS | | 4 | NAS YEK YEK YEK YEK YEK FC YEK CC CC NAS CC DI DI DI AI AI NAS NAS YEK YEK NAS LR FC | | 5 | YEK YEK YEK YEK YEK YEK CC CC CC DI DI DI FC LR AI AI FC NAS NAS FC YEK YEK | | Q6 | YEK YEK FC YEK CC YEK YEK CC CC CC CC CC CC DI DI DI NAS AI NAS NAS YEK NAS NAS | | 7 | FC YEK YEK YEK YEK CO CC CO CC TI DI DI DI DI LR LR LR LR NAS FC FC FC | | Q8 | FC YEK YEK YEK CC CC CC CC CC LR CC DI CC FC FC YEK LR NAS NAS NAS LR YEK YEK | | 9 | FC YEK YEK YEK YEK YEK CO LR YEK YEK YEK YEK FC YEK DI LR NAS DI NAS AI AI NAS FC YEK | | D10| YEK YEK YEK CO CO UE UE UE UE TI TI DI TI LR NAS LR LR NAS LR FC FC YEK YEK | | D11| YEK CO CO YEK TI CC CC CC CC CC CC DI DI DI AI AI LR NAS NAS FC FC YEK YEK | | D12| YEK YEK YEK CO CO CO CO CO TI TI DI DI DI AI AI TI LR NAS NAS FC FC FC FC | | 13 | YEK YEK YEK YEK CO CC CC CC CC CC DI DI DI DI AI DI YEK LR NAS NAS FC FC NAS FC | | 14 | YEK YEK YEK YEK CO CC CC CC CC CC DI DI DI FC LR AI AI NAS NAS FC YEK FC FC | | 15 | FC FC NAS YEK CO CC CC CC CC DI DI AI AI LR LR LR NAS NAS LR FC FC YEK | | 16 | YEK YEK YEK YEK YEK CC CO CO LR CC DI DI DI AI LR AI LR NAS NAS NAS LR NAS NAS FC | | 17 | YEK FC YEK YEK YEK CC CO FC CO CC TI TI DI DI TI DI NAS LR NAS AI NAS NAS FC FC | | 18 | YEK YEK YEK YEK CO CC CO CO CC NAS NAS DI DI DI LR DI YEK NAS FC NAS NAS LR FC | | 19 | FC LR FC YEK CO CC CO CC CC DI DI TI CO FC YEK YEK LR NAS NAS NAS LR FC YEK | | Q20| YEK FC YEK YEK YEK YEK YEK CC CO CC CC YEK YEK YEK YEK YEK NAS NAS NAS NAS FC FC | | 21 | FC NAS YEK YEK YEK YEK YEK CO CO CO CC CC TI TI TI DI AI AI NAS AI NAS YEK YEK YEK | | Q22| FC FC YEK YEK FC YEK YEK YEK CO CO CC DI TI TI TI TI AI NAS AI LR AI NAS NAS FC | | D23| FC YEK FC FC YEK YEK CO CC CO UE TI AI DI DI AI AI AI AI NAS NAS NAS FC FC | | 24 | YEK YEK YEK YEK YEK CO YEK YEK YEK CO CO NAS DI DI LR AI AI AI LR NAS NAS NAS LR FC | | 25 | FC YEK YEK YEK CO CC CO CO CC DI DI DI DI AI DI LR FC NAS NAS NAS NAS FC | | 26 | FC YEK YEK YEK YEK YEK LR LR CC CC CC TI TI DI DI FC NAS LR NAS NAS FC FC YEK YEK | | Q27| YEK YEK YEK YEK YEK CC CC LR NAS NAS FC FC DI DI DI NAS NAS NAS NAS NAS NAS | | 28 | FC FC FC YEK YEK YEK YEK LR LR CC NAS FC YEK TI DI NAS NAS AI NAS NAS NAS FC FC FC | ### IDENTIFICATION - **GEOGRAPHIC** - LAT LONG - AI = ABISKO 68 21.5 18 49.4 - BW = BARROW 71 18.2 -156 44.9 - CC = C. CHELYUSKIN 77 43.0 104 17.0 - CO = COLLEGE 64 51.6 -147 50.2 - GWR = GREAT WHALE R. 55 16.0 -77 47.0 - DI = DIXON ISLAND 73 32.6 80 33.7 - **GEOMAGNETIC** - LAT LONG - FC = FT. CHURCHILL 58 48.0 -94 06.0 - LR = LEIRVOGUR 64 11.0 -21 42.0 - NAS = NARSSARSSUAQ 61 06.0 -45 12.0 - TI = TIXIE BAY 71 35.0 129 00.0 - UE = CAPE WELLEN 66 09.8 -169 50.1 - YEK = YELLOWKNIFE 62 24.0 245 36.0 *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH.* | UT | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----| | 01 | AI | LR | LR | LR | LR | NAS | NAS | YEK | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | | 02 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 03 | DI | DI | DI | DI | DI | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | | 04 | AI | AI | AI | AI | AI | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | | 05 | Q6 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 06 | Q7 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 07 | Q8 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 08 | Q9 | CC | CC | CC | CC | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | | 09 | D10 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 10 | D11 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 11 | D12 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 12 | D13 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 13 | D14 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 14 | D15 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 15 | D16 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 16 | D17 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 17 | D18 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 18 | D19 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 19 | Q20 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 20 | Q21 | CC | CC | CC | CC | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | UE | | 21 | Q22 | AI | AI | AI | AI | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | | 22 | Q23 | CC | CC | CC | CC | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | | 23 | Q24 | AI | AI | AI | AI | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | | 24 | Q25 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 25 | Q26 | AI | AI | AI | AI | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | LR | | 26 | Q27 | UE | UE | UE | UE | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | CC | | 27 | Q28 | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 28 | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | DI | *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH. AI = ABISKO BW = BARRON CC = CACHETUSKIN CO = COLLEGE GWR = GREAT WHALE R. DI = DIXON ISLAND LAT LONG LAT LONG LAT LONG LAT LONG 68 21°5 16 49°4 66°0 11 4°9 50 48°0 -94°06°0 68°7 322°6 71 18°2 -156 44°9 68°5 241°1 64°11°0 -21°42°0 70°2 71°0 77 43°0 104 17°0 66°2 176°4 61°06°0 -45°12°0 71°0 37°0 64 51°6 -147 50°2 64°6 256°5 71°35°0 129°00°0 60°4 191°4 55 16°0 -77 47°0 66°5 347°4 66°09°0 -169°50°1 61°7 237°0 73 32°6 80 33°7 63°0 161°5 62°24°0 245°36°0 69°0 292°0 FC = FT. CHURCHILL LR = LEIRVOGUR NAS = NARSSARSSUAQ TI = TIXIE BAY UE = CAPE WELLEN YEK = YELLOWKNIFE AL = MINIMUM DELTA H | MARCH | 1975 | |-------|------| | UT | 01 | | | 02 | | | 03 | | | 04 | | | 05 | | | 06 | | | 07 | | | 08 | | | 09 | | | 10 | | | 11 | | | 12 | | | 13 | | | 14 | | | 15 | | | 16 | | | 17 | | | 18 | | | 19 | | | 20 | | Q21 | | | Q22 | | | Q23 | | | Q24 | | | Q25 | | | 26 | | | 27 | | | 28 | | | 29 | | | 30 | | | 31 | | **IDENTIFICATION** - A1 = ABISKO - BN = BARROW - CC = C. CHEL YUSKIN - CO = COLLEGE - GWR = GREAT WHALE R. - DI = DIXON ISLAND **GEOGRAPHIC** - LAT - LONG **GEOMAGNETIC** - LAT - LONG **IDENTIFICATION** - FC = FT. CHURCHILL - LR = LEIRNOGUR - NAS = NARSSARSSUAQ - TI = TIXIE BAY - UE = CAPE WELLEN - YEK = YELLOWKNIFE *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH.* | MARCH | 1975 | |-------|------| | UT | 01 | | | 02 | | | 03 | | | 04 | | | 05 | | | 06 | | | 07 | | | 08 | | | 09 | | | 10 | | | 11 | | | 12 | | | 13 | | | 14 | | | 15 | | | 16 | | | 17 | | | 18 | | | 19 | | | 20 | | | 21 | | | 22 | | | 23 | | | 24 | | | 25 | | | 26 | | | 27 | | | 28 | | | 29 | | | 30 | | | 31 | **TABLE OF OBSERVATORIES SUPPLYING HOURLY AL BASED ON MEAN VALUE** AL = MINIMUM DELTA H | IDENTIFICATION | GEOGRAPHIC | GEOMAGNETIC | IDENTIFICATION | GEOGRAPHIC | GEOMAGNETIC | |----------------|------------|-------------|----------------|------------|-------------| | AI = ABISKO | LAT | LONG | FC = FT. CHURCHILL | LAT | LONG | | BW = BARROW | 68 21°.5 | 18 49°.4 | LR = LEIRVOGUR | 58 48°.0 | -94 06°.0 | | CC = CHELYUSKIN| 71 18°.2 | -156 44°.9 | NAS = NARSSARSSUAQ| 64 21°.0 | -21 42°.0 | | CO = COLLEGE | 77 43°.0 | 104 17°.0 | TI = TIXIE BAY | 61 06°.0 | -45 12°.0 | | GHR = GREAT WHALE R. | 64 51°.6 | -147 50°.2 | UE = CAPE WELLEN | 71 35°.0 | 00°.0 129°.0 | | DI = DIXON ISLAND | 73 32°.6 | 80 33°.7 | YEK = YELLOWKNIFE | 66 09°.6 | -169 50°.1 | | | | | | 62 24°.0 | 245 36°.0 | | | | | | 69°.0 | 292°.0 | *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH.* ## TABLE OF OBSERVATORIES SUPPLYING HOURLY AU ### BASED ON MEAN VALUE **APRIL 1975** | UT | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----| | 1 | FC | FC | AI | AI | AI | CO | CO | CC | CO | CC | CC | DI | DI | DI | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | 2 | GWR | GWR | FC | FC | GWR | NAS | NAS | GWR | GWR | GWR | GWR | CC | CC | UE | UE | DI | NAS | AI | NAS | NAS | NAS | NAS | NAS | | 3 | GWR | CC | CC | GWR | LR | GWR | GWR | CO | CO | CC | CC | DI | DI | DI | AI | AI | NAS | NAS | NAS | NAS | NAS | GWR | | 4 | GWR | GWR | GWR | GWR | AI | NAS | NAS | CC | CO | CC | CC | DI | DI | DI | AI | LR | LR | AI | NAS | NAS | NAS | NAS | GWR | | 5 | GWR | GWR | GWR | GWR | LR | UE | CO | CO | CC | CC | CC | CC | TI | DI | LR | AI | LR | NAS | NAS | NAS | GWR | GWR | | 6 | GWR | DI | GWR | GWR | AI | CO | CO | CC | CC | CC | CC | TI | DI | DI | AI | AI | NAS | NAS | NAS | NAS | GWR | GWR | NAS | | 7 | GWR | GWR | GWR | CO | GWR | GWR | CC | CO | CC | CC | DI | DI | DI | CO | LR | CO | LR | NAS | NAS | GWR | GWR | GWR | GWR | | D8 | GWR | CO | CO | DI | CC | CO | CC | CC | DI | TI | TI | DI | AI | AI | LR | LR | NAS | LR | GWR | GWR | NAS | DI | GWR | | D9 | CO | CO | CO | CO | CO | UE | UE | JE | TI | DI | DI | DI | AI | AI | AI | AI | NAS | GWR | NAS | GWR | GWR | GWR | GWR | | D10| GWR | CO | CO | CO | CO | CO | CC | CC | TI | DI | DI | DI | DI | DI | LR | AI | NAS | NAS | LR | NAS | GWR | GWR | GWR | | D11| YEK | YEK | CO | YEK | CO | CC | CC | DI | AI | AI | DI | AI | LR | NAS | LR | NAS | NAS | NAS | NAS | GWR | GWR | | 12 | GWR | YEK | YEK | YEK | YEK | CO | CC | CC | DI | DI | TI | TI | DI | LR | AI | AI | LR | NAS | NAS | NAS | GWR | GWR | GWR | | D13| CO | CO | CO | CO | CO | CC | CC | DI | TI | CO | CC | CC | DI | AI | AI | DI | NAS | DI | NAS | LR | NAS | GWR | GWR | GWR | | 14 | YEK | CO | CO | CO | CO | CC | CO | LR | LR | CC | CC | DI | DI | DI | LR | LR | LR | LR | NAS | GWR | NAS | GWR | GWR | | 15 | YEK | GWR | YEK | GWR | YEK | YEK | YEK | CC | CC | CC | CC | CC | DI | DI | AI | LR | AI | NAS | NAS | NAS | NAS | GWR | | 16 | GWR | GWR | YEK | YEK | YEK | YEK | YEK | TI | CO | CC | CC | CC | CC | CC | CC | UE | DI | LR | NAS | NAS | NAS | NAS | NAS | GWR | | Q17| GWR | GWR | GWR | GWR | YEK | YEK | YEK | YEK | CC | CC | CC | CC | CC | CC | CC | CO | CC | LR | AI | LR | NAS | NAS | NAS | NAS | | 18 | NAS | GWR | GWR | YEK | YEK | YEK | YEK | CO | CO | GWR | CC | TI | TI | DI | DI | LR | LR | LR | LR | LR | LR | GWR | GWR | | Q19| GWR | GWR | GWR | YEK | YEK | YEK | CO | CO | CO | CO | CC | CC | DI | DI | DI | CC | CC | LR | AI | GWR | LR | GWR | GWR | | 20 | GWR | GWR | GWR | GWR | YEK | YEK | YEK | CO | CC | CC | CC | CC | CC | DI | DI | AI | AI | LR | LR | GWR | GWR | GWR | GWR | | 21 | YEK | CO | CO | YEK | GWR | LR | NAS | TI | CO | CO | TI | TI | TI | TI | LR | LR | AI | LR | NAS | NAS | GWR | NAS | NAS | NAS | | 22 | YEK | YEK | YEK | YEK | CO | CO | CO | CC | CC | YEK | GWR | CO | CC | DI | DI | DI | NAS | NAS | NAS | LR | FC | FC | FC | | 23 | YEK | YEK | YEK | YEK | CO | CC | CO | CC | CC | DI | TI | TI | TI | DI | LR | LR | AI | NAS | NAS | NAS | GWR | GWR | YEK | | 24 | YEK | YEK | YEK | YEK | CO | CO | CC | CC | CC | DI | CC | DI | CC | DI | AI | LR | NAS | NAS | LR | FC | NAS | FC | GWR | | 25 | YEK | YEK | GWR | YEK | YEK | CO | YEK | YEK | CO | CC | CC | CC | CC | CC | CC | DI | DI | AI | AI | NAS | NAS | NAS | GWR | NAS | NAS | FC | | 26 | YEK | GWR | YEK | YEK | AI | YEK | FC | YEK | NAS | CC | CC | CC | CC | CC | CC | DI | LR | LR | LR | NAS | NAS | NAS | NAS | FC | YEK | | Q27| YEK | FC | FC | YEK | CO | CC | YEK | TI | NAS | CC | CC | CC | CC | CC | DI | DI | NAS | LR | NAS | NAS | NAS | NAS | NAS | FC | | Q28| FC | FC | FC | FC | FC | YEK | YEK | YEK | YEK | GWR | GWR | GWR | CC | CO | CO | DI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | Q29| GWR | GWR | GWR | YEK | YEK | YEK | YEK | YEK | YEK | CO | CC | CC | CC | CC | CC | TI | LR | DI | NAS | NAS | LR | NAS | NAS | NAS | FC | | 30 | NAS | YEK | YEK | YEK | YEK | YEK | YEK | CO | CO | CO | CC | CC | CC | CC | CC | FC | DI | DI | LR | LR | NAS | NAS | NAS | FC | FC | --- ### IDENTIFICATION - **GEOGRAPHIC** - **LAT** - **AI**: Abisko 68° 21.5' - **BW**: Barrow 71° 18.2' - **CC**: Chelyuskin 77° 43.0' - **CO**: College 64° 51.6' - **GWR**: Great Whale R. 55° 16.0' - **DI**: Dixon Island 73° 32.6' - **LONG** - **AI**: 18° 49.4' - **BW**: -156° 44.9' - **CC**: 104° 17.0' - **CO**: -147° 50.2' - **GWR**: 66° 5' - **DI**: 80° 33.7' - **GEOMAGNETIC** - **LAT** - **AI**: 66.0' - **BW**: 68.5' - **CC**: 66.2' - **CO**: 64.6' - **GWR**: 66.5' - **DI**: 63.0' - **LONG** - **AI**: 114.9' - **BW**: 241.1' - **CC**: 176.4' - **CO**: 256.5' - **GWR**: 347.4' - **DI**: 161.5' --- ### IDENTIFICATION - **GEOGRAPHIC** - **LAT** - **FC**: Ft. Churchill 58° 48.0' - **LR**: Leirvogur 64° 11.0' - **NAS**: Narssarssuaq 61° 06.0' - **TI**: Tixie Bay 71° 35.0' - **UE**: Cape Wellen 66° 09.8' - **YEK**: Yellowknife 62° 24.0' - **LONG** - **FC**: -94° 06.0' - **LR**: -21° 42.0' - **NAS**: -45° 12.0' - **TI**: 129° 00.0' - **UE**: -169° 50.1' - **YEK**: 245° 36.0' --- *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH.* | APRIL | 1975 | |-------|------| | UT | 01 | | | 02 | | | 03 | | | 04 | | | 05 | | | 06 | | | 07 | | | 08 | | | 09 | | | 10 | | | 11 | | | 12 | | | 13 | | | 14 | | | 15 | | | 16 | | | 17 | | | 18 | | | 19 | | | 20 | | | 21 | | | 22 | | | 23 | | | 24 | | | 25 | | | 26 | | | 27 | | | 28 | | | 29 | | | 30 | **TABLE OF OBSERVATORIES SUPPLYING HOURLY AL BASED ON MEAN VALUE** | IDENTIFICATION | GEOGRAPHIC | GEOMAGNETIC | IDENTIFICATION | GEOGRAPHIC | GEOMAGNETIC | |----------------|------------|-------------|----------------|------------|-------------| | AI = ABISKO | LAT | LONG | FC = FT. CHURCHILL | LAT | LONG | | BW = BARRON | 68 | 21.5 | LR = LEIRVOGUR | 58 | 48.0 | | CC = C. CHELYUSKIN | 71 | 18.2 | NAS = NARSSARSSUAQ | 64 | 11.0 | | CO = COLLEGE | 77 | 43.0 | TI = TIXIE BAY | 61 | 06.0 | | GWR = GREAT WHALE R. | 64 | 51.6 | UE = CAPE WELLEN | 71 | 35.0 | | DI = DIXON ISLAND | 73 | 32.6 | YEK = YELLOWKNIFE | 66 | 09.8 | *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH.* | UT | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----| | 1 | FC | DI | FC | YEK | YEK | CO | CO | CO | CO | TI | DI | DI | DI | DI | DI | LR | LR | LR | LR | NAS | NAS | NAS | FC | FC | | 2 | FC | FC | FC | YEK | YEK | CO | CO | CO | CO | CC | CC | CC | CC | CC | CC | DI | DI | DI | DI | NAS | NAS | NAS | GWR | FC | | 3 | FC | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | AI | AI | AI | AI | NAS | NAS | NAS | FC | FC | | 4 | YEK | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 5 | CO | YEK | CO | CO | CO | CO | CO | CO | CO | TI | TI | TI | TI | TI | TI | AI | AI | AI | AI | NAS | NAS | NAS | FC | FC | | 6 | CO | YEK | CO | CO | CO | CO | CO | CO | CO | TI | TI | TI | TI | TI | TI | AI | AI | AI | AI | NAS | NAS | NAS | FC | FC | | 7 | FC | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 8 | YEK | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 9 | YEK | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 10 | GMR | YEK | CO | CO | CO | CO | CO | CO | CO | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 11 | DI | YEK | FC | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 12 | DI | YEK | FC | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 13 | DI | YEK | FC | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 14 | YEK | YEK | CO | CO | CO | CO | CO | CO | CO | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 15 | DI | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 16 | FC | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 17 | YEK | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 18 | FC | GMR | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 19 | FC | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 20 | FC | YEK | YEK | YEK | YEK | CC | CC | CC | CC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | FC | FC | | 21 | Q2 | FC | CO | CO | CO | CO | CO | CO | CO | CC | CC | CC | CC | CC | CC | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 22 | FC | DI | FC | GWR | YEK | CO | CO | CO | CO | CC | CC | CC | CC | CC | CC | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 23 | FC | DI | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 24 | FC | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 25 | FC | YEK | YEK | YEK | YEK | FC | YEK | FC | YEK | CC | CC | CC | CC | CC | CC | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 26 | YEK | CO | CO | CO | CO | CO | CO | CO | CO | CC | CC | CC | CC | CC | CC | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 27 | FC | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 28 | FC | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 29 | FC | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 30 | FC | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | | 31 | FC | FC | FC | FC | FC | FC | FC | FC | FC | TI | TI | TI | TI | TI | TI | DI | DI | DI | DI | NAS | NAS | NAS | DI | DI | *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH. **IDENTIFICATION** AI = ABISKO BW = BARROW CC = CHELYUSKIN CO = COLLEGE GMR = GREAT WHALE R. DI = DIXON ISLAND **GEOGRAPHIC** LAT LONG LAT LONG 68 21°5 18 49°4 66°0 114°9 71 18°2 -156 44°9 68°5 241°1 77 43°0 104 17°0 66°2 176°4 64 51°6 -147 50°2 64°6 256°5 55 16°0 -77 47°0 66°5 347°4 73 32°6 80 33°7 63°0 161°5 **GEOMAGNETIC** FC = FT. CHURCHILL LR = LEIRVOGUR NAS = NARSSARSSUAQ TI = TITTE BAY UE = CAPE WELLEN YEK = YELLOWKNIFE **IDENTIFICATION** AI = ABISKO BW = BARROW CC = CHELYUSKIN CO = COLLEGE GMR = GREAT WHALE R. DI = DIXON ISLAND | UT | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----| | 1 | UE | TI | TI | NAS | LR | LR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | AI | AI | FC | CO | YEK | YEK | TI | TI | TI | TI | TI | TI | TI | TI | | 2 | LR | LR | LR | LR | LR | LR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | AI | AI | CO | CO | YEK | YEK | TI | TI | TI | TI | TI | TI | TI | TI | | 3 | LR | LR | LR | LR | LR | LR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | AI | AI | CO | CO | YEK | YEK | CC | CC | DI | DI | DI | DI | DI | DI | | 4 | LR | LR | LR | LR | LR | LR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 5 | LR | LR | LR | LR | LR | LR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 6 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 7 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 8 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 9 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 10 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 11 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 12 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 13 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 14 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 15 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 16 | UE | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 17 | AI | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 18 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 19 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 20 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 21 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 22 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 23 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 24 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 25 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 26 | AI | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 27 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 28 | LR | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 29 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 30 | TI | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | | 31 | LR | NAS | NAS | TI | TI | TI | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | FC | FC | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | YEK | *THE ONLY OBSERVATORY NOT PROVIDING DATA FOR THIS MONTH. | IDENTIFICATION | GEOGRAPHIC | GEOMAGNETIC | IDENTIFICATION | |----------------|------------|-------------|----------------| | AI = ABISKO | LAT | LONG | LAT | | BW = BARRON | 68°21'5" | 114°9" | 58°48'0" | | CC = C. CHELYUSKIN | 71°18'2" | -156°44'9" | 64°11'1" | | CO = COLLEGE | 77°43'0" | 104°17'0" | 66°2 | | GWR = GREAT WHALE R. | 64°51'6" | -147°50'2" | 64°6 | | DI = DIXON ISLAND | 73°32'6" | 80°33'7" | 63°0 | | IDENTIFICATION | GEOGRAPHIC | GEOMAGNETIC | IDENTIFICATION | |----------------|------------|-------------|----------------| | FC = FT. CHURCHILL | 58°48'0" | 68°7 | 322°8 | | LR = LEIRVOGUR | 64°11'1" | -21°42'0" | 70°2 | | NAS = NARSSARSSUAQ | 61°06'0" | -45°12'0" | 71°0 | | TT = TIXIE BAY | 71°35'0" | 129°00'0" | 60°4 | | UE = CAPE WELLEN | 66°09'8" | -169°50'1" | 61°7 | | YEK = YELLOWKNIFE | 62°24'0" | 245°36'0" | 69°0 | | JUNE 1975 | UT | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | |-----------|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|----| | D 1 | LR | NAS | NAS | NAS | TI | GWR | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | FC | | D 2 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 3 | AT | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 4 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | D 5 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | D 6 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | D 7 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 8 | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 9 | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 10 | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 11 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | NAS | | D 12 | AI | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 13 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 14 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 15 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 16 | AI | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 17 | CC | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 18 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 19 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 20 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 21 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 22 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 23 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 24 | CC | CC | CC | CC | CC | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 25 | TI | TI | TI | TI | TI | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 26 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 27 | UE | TI | TI | TI | TI | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 28 | LR | CC | CC | CC | CC | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 29 | LR | CC | CC | CC | CC | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | | D 30 | LR | LR | LR | LR | LR | NAS | NAS | NAS | NAS | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | GWR | **IDENTIFICATION** - **AI** = ABISKO - **BW** = BARROW - **CC** = CHELYUSKIN - **CO** = COLLEGE - **GWR** = GREAT WHALE R. - **DI** = DIXON ISLAND **GEOGRAPHIC** - **LAT** = LATITUDE - **LONG** = LONGITUDE **GEOMAGNETIC** - **FC** = FT. CHURCHILL - **LR** = LEIRVOGUR - **NAS** = NARSSARSSUAQ - **TI** = TIXIE BAY - **UE** = CAPE WELLEN - **YEK** = YELLOWKNIFE **IDENTIFICATION** - **AL** = MINIMUM DELTA H **AL BASED ON MEAN VALUE** **TABLE OF OBSERVATORIES SUPPLYING HOURLY** SECTION III. GRAPHS OF INDICES, STATISTICAL DATA AND MAGNETOGRAMS 1. Explanation Daily Graphs of 1.0-min Auroral Electrojet Indices. The following graphs are prints of computer-drawn plots of variations of the 1.0-min indices AU, AL, AE and AO for each day of January-June 1975. Dates on the graphs are given as year/month/day: (75/04/12) is 12 April 1975. Number of stations used for index derivations during each month is indicated in the upper right corner as, for example AE(11). Universal Time is indicated along the horizontal axis. Note that hour "1" in the tables in Section II refers to the interval from 0000-0100 UT on the graphs. The graph scale on which AU and AL are plotted is -1500 to 1000 nanoTeslas; that of AE and AO is -500 to 1000 nanoTeslas. During some very disturbed intervals, the AO trace reached the lower limit of the microfilm plotting frame. Also, during large disturbances it is common for the AL and AE traces to overlap and become difficult to distinguish. It was not practical to change graph scales for such short, disturbed intervals and users interested in those times are encouraged to request listings of 1.0-min index values. Stacked Common Scale Magnetograms. The following six graphs display the condensed stacked plots of the H (or X) 1-min variations for all stations for each month. Amplitude scales are given below each figure, corresponding to the centimeter scale at the lower right. Station abbreviations, component, north polar distance and east longitude are given for each station providing data for at least part of each month. Frequency of AU and AL Provision by Station and Total Amplitude of Most Positive and Most Negative H Variations. Figures 3-26 display for each month statistical information concerning the time and frequency with which each station gives 1-min AU and AL indices and the total (cumulative) amplitude of extreme magnetic variations at those times when the stations were giving the indices. The curves were smoothed with an 11-point running mean. Arrows mark the UT time of Local Geomagnetic Midnight at each site. The UT day is shown twice so that patterns of systematic occurrence of extreme variations at the critically located sites will not be interrupted by day-end. It is evident that the time at which AU is most frequently derived from each site, peaks some 6 h before Local Geomagnetic Midnight but that substorm related AU may occur frequently over a 6- to 9-h interval centered on 1800 LGT. Also, the larger amplitude positive variations occur during those hours when the sites are most often the source of AU. For AL, each site is most often in the critical position beneath the westward electrojet around 3 h after Local Geomagnetic Midnight. The larger negative H variations also occur most frequently around 0300 LGT. A few pre-midnight and midnight large-amplitude events, however, often appear to complicate this simple pattern. The College Observatory site is somewhat exceptional, because it, more than all the other AE stations is optimally located to monitor large AL-producing events during several hours about Local Geomagnetic Midnight. 1. Daily Graphs of 1.0-min Auroral Electrojet Indices 4. Frequency of AU and AL Total Amplitude Plots Fig. 3. Frequency of 1-min AU provision by station for January 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 4. Total amplitude of most positive H variations for January 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 5. Frequency of 1-min AL provision by station for January 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 6. Total amplitude of most negative H variations for January 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 7. Frequency of 1-min AU provision by station for February 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 8. Total amplitude of most positive H variations for February 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 9. Frequency of 1-min AL provision by station for February 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 10. Total amplitude of most negative H variations for February 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 11. Frequency of 1-min AU provision by station for March 1975. For each station an arrow marks the UT time of Local Geomagnetic midnight. Fig. 12. Total amplitude of most positive H variations for March 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 13. Frequency of 1-min AL provision by station for March 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 14. Total amplitude of most negative H variations for March 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 15. Frequency of 1-min AU provision by station for April 1975. For each station and arrow marks the UT time of Local Geomagnetic Midnight. Fig. 16. Total amplitude of most positive H variations for April 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 17. Frequency of 1-min AL provision by station for April 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 18. Total amplitude of most negative H variations for April 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 19. Frequency of 1-min AU provision by station for May 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 20. Total amplitude of most positive H variations for May 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 21. Frequency of 1-min AL provision by station for May 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 22. Total amplitude of most negative H variations for May 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 23. Frequency of 1-min AU provision by station for June 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 24. Total amplitude of most positive H variations for June 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. Fig. 25. Frequency of 1-min AL provision by station for June 1975. For each station and arrow marks the UT time of Local Geomagnetic Midnight. Fig. 26. Total amplitude of most negative H variations for June 1975. For each station an arrow marks the UT time of Local Geomagnetic Midnight. UAG Series of Reports UAG Reports are issued on an irregular basis, with 6 to 12 reports being issued each year. Subscriptions may be ordered through the National Geophysical and Solar-Terrestrial Data Center, Environmental Data and Information Service, NOAA, Boulder, CO 80303, USA. The annual subscription price is $25.20 ($17.30 additional for foreign mailing). In years when the single price copies are less than $25.20, arrangements will be made to extend the subscription duration. Single issues are also available at the prices shown below. Some of the issues are now out of print and are available only on microfiche. Orders must include check or money order payable in U.S. currency to the Department of Commerce, NOAA/NGSDC. $2.00 handling charge per order. | UAG-1 | "IQSY Night Airglow Data", price $1.75. | |-------|----------------------------------------| | UAG-2 | "A Reevaluation of Solar Flares, 1964-1966", price 30 cents. | | UAG-3 | "Observations of Jupiter's Sporadic Radio Emission in the Range 7.6-41 MHz, 6 July 1966 through 8 September 1968", microfiche only, price 45 cents. | | UAG-4 | "Abbreviated Calendar Record 1966-1967", price $1.25. | | UAG-5 | "Data on Solar Event of May 23, 1967 and its Geophysical Effects", price 65 cents. | | UAG-6 | "International Geophysical Calendars 1957-1969", price 30 cents. | | UAG-7 | "Observations of the Solar Electron Corona: February 1964-January 1968", price 15 cents. | | UAG-8 | "Data on Solar-Geophysical Activity October 24-November 6, 1968", price (includes Parts 1 & 2) $1.75. | | UAG-9 | "Data on Cosmic Ray Event of November 18, 1968 and Associated Phenomena", price 55 cents. | | UAG-10 | "Atlas of Ionograms", price $1.50. | | UAG-11 | "Catalogue of Data on Solar-Terrestrial Physics" (now obsolete). | | UAG-12 | "Solar-Geophysical Activity Associated with the Major Geomagnetic Storm of March 8, 1970", price (includes Parts 1-3) $3.00. | | UAG-13 | "Data on the Solar Proton Event of November 2, 1969 through the Geomagnetic Storm of November 8-10, 1969, price 50 cents. | | UAG-14 | "An Experimental, Comprehensive Flare Index and Its Derivation for 'Major' Flares, 1955-1969", price 30 cents. | | UAG-15 | "Catalogue of Data on Solar-Terrestrial Physics" (now obsolete). | | UAG-16 | "Temporal Development of the Geographical Distribution of Auroral Absorption for 30 Substorm Events in each of IQSY (1964-65) and IASY (1969)", price 70 cents. | | UAG-17 | "Ionospheric Drift Velocity Measurements at Jicamarca, Peru (July 1967-March 1970)", microfiche only, price 45 cents. | | UAG-18 | "A Study of Polar Cap and Auroral Zone Magnetic Variations", price 20 cents. | | UAG-19 | "Reevaluation of Solar Flares 1967", price 15 cents. | | UAG-20 | "Catalogue of Data on Solar-Terrestrial Physics" (now obsolete). | | UAG-21 | "Preliminary Compilation of Data for Retrospective World Interval July 26 - August 14, 1972", price 70 cents. | | UAG-22 | "Auroral Electrojet Magnetic Activity Indices (AE) for 1970", price 75 cents. | | UAG-23 | "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Second Edition, November 1972", edited by W. R. Piggott and K. Rawer, NGSDC/EDS/NOAA, November 1972, 324 pages, price $1.75. | | UAG-23A | "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Second Edition, November 1972", Revision of Chapters 1-4, edited by W. R. Piggott and K. Rawer, NGSDC/EDS/NOAA, July 1978, 135 pages, price $2.14. | | UAG-24 | "Data on Solar-Geophysical Activity Associated with the Major Ground Level Cosmic Ray Events of 24 January and 1 September 1971", price (includes Parts 1 and 2) $2.00. | | UAG-25 | "Observations of Jupiter's Sporadic Radio Emission in the Range 7.6-41 MHz, 9 September 1968 through 9 December 1971", price 35 cents. | | UAG-26 | "Data Compilation for the Magnetospherically Quiet Periods February 19-23 and November 29 - December 3, 1970", price 70 cents. | | UAG-27 | "High Speed Streams in the Solar Wind", price 15 cents. | | UAG-28 | "Collected Data Reports on August 1972 Solar-Terrestrial Events", price (includes Parts 1-3) $4.50. | | UAG-29 | "Auroral Electrojet Magnetic Activity Indices AE (11) for 1968", price 75 cents. | | UAG-30 | "Catalogue of Data on Solar-Terrestrial Physics", price $1.75. | | UAG-31 | "Auroral Electrojet Magnetic Activity Indices AE (11) for 1969", price 75 cents. | | UAG-32 | "Synoptic Radio Maps of the Sun at 3.3 mm for the Years 1967-1969", price 35 cents. | | UAG-33 | "Auroral Electrojet Magnetic Activity Indices AE (10) for 1967", price 75 cents. | | UAG-34 | "Absorption Data for the IGY/IGC and IQSY", price $2.00. | | UAG-35 | "Catalogue of Digital Geomagnetic Variation Data at World Data Center A for Solar-Terrestrial Physics", price 20 cents. | | UAG-36 | "An Atlas of Extreme Ultraviolet Flashes of Solar Flares Observed Via Sudden Frequency Deviations During the ATM-SKYLAB Missions", price 55 cents. | | UAG-37 | "Auroral Electrojet Magnetic Activity Indices AE (10) for 1966", price 75 cents. | | UAG-38 | "Master Station List for Solar-Terrestrial Physics Data at WDC-A for Solar-Terrestrial Physics", price $1.60. | | UAG-39 | "Auroral Electrojet Magnetic Activity Indices AE (11) for 1971", by Joe Haskell Allen, Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service, February 1975, 144 pages, price $2.05. | | UAG-40 | "H-Alpha Synoptic Charts of Solar Activity For the Period of Skylab Observations, May, 1973-March, 1974", by Patrick S. McIntosh, NOAA Environmental Research Laboratories, February 1975, 32 pages, price 56 cents. | | UAG-41 | "H-Alpha Synoptic Charts of Solar Activity During the First Year of Solar Cycle 20, October, 1964 - August, 1965", by Patrick S. McIntosh, NOAA Environmental Research Laboratories, and Jerome T. Nolte, American Science and Engineering, Cambridge, Massachusetts, March 1975, 25 pages, price 48 cents. | | UAG-42 | "Observations of Jupiter's Sporadic Radio Emission in the Range 7.6-80 MHz 10 December 1971 through 21 March 1975", by James W. Warwick, George A. Dulk, and Anthony C. Riddle, Department of Astro-Geophysics, University of Colorado, Boulder, Colorado 80302, April 1975, 49 pages, price $1.15. | | UAG-43 | "Catalog of Observation Times of Ground-Based Skylab-Coordinated Solar Observing Programs", compiled by Helen E. Coffey, World Data Center A for Solar-Terrestrial Physics, May 1975, 159 pages, price $3.00. | | UAG-44 | "Synoptic Maps of Solar 9.1 cm Microwave Emission from June 1962 to-August 1973", by Werner Graf and Ronald N. Bracewell, Radio Astronomy Institute, Stanford University, Stanford, California 94305, May 1975, 183 pages, price $2.55. | | UAG-45 | "Auroral Electrojet Magnetic Activity Indices AE (11) for 1972", by Joe Haskell Allen, Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service, May 1975, 144 pages, price $2.10. | | UAG-46 | "Interplanetary Magnetic Field Data 1963-1974", by Joseph H. King, National Space Science Data Center, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, June 1975, 382 pages, price $2.95. | | UAG-47 | "Auroral Electrojet Magnetic Activity Indices AE (11) for 1973", by Joe Haskell Allen, Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service, June 1975, 144 pages, price $2.10. | UAG-48A "Synoptic Observations of the Solar Corona during Carrington Rotations 1580-1596 (11 October 1971 - 15 January 1973)", [Reissue with quality images] by R. A. Howard, M. J. Koomen, D. J. Michels, R. Tousey, C. R. Detwiler, D. E. Roberts, R. T. Seal and J. D. Whitney, E. O. Hulbert Center for Space Research, NRL, Washington, D. C. 20375 and R. T. and S. F. Hansen, C. J. Garcia and E. Yasukawa, High Altitude Observatory, NCAR, Boulder, Colorado 80303, February 1976, 200 pages, price $4.27. UAG-49 "Catalog of Standard Geomagnetic Variation Data", prepared by Environmental Data Service, NOAA, Boulder, Colorado, August 1975, 125 pages, price $1.85. UAG-50 "High-Latitude Supplement to the URSI Handbook on Ionogram Interpretation and Reduction", by W. R. Piggott, British Antarctic Survey, c/o SRC, Appleton Laboratory, Ditton Park, Slough, England, October 1975, 292 pages, price $4.00. UAG-51 "Synoptic Maps of Solar Coronal Hole Boundaries Derived from He II 304Å Spectroheliograms from the Manned Skylab Missions", by J. D. Bohlin and D. M. Rubenstein, E. O. Hulbert Center for Space Research, Naval Research Laboratory, Washington, D. C. 20375 U.S.A., November 1975, 30 pages, price 54 cents. UAG-52 "Experimental Comprehensive Solar Flare Indices for Certain Flares, 1970-1974", compiled by Helen W. Dodson and E. Ruth Hedeman, McMath-Hulbert Observatory, The University of Michigan, 895 Lake Angelus Road North, Pontiac, Michigan 48055 U.S.A., November 1975, 27 pages, price 60 cents. UAG-53 "Description and Catalog of Ionospheric F-Region Data, Jicamarca Radar Observatory (November 1966 - April 1969)", by W. L. Clark and T. E. Van Zandt, Aeronomy Laboratory, NOAA, Boulder, Colorado 80302 and J. P. McClure, University of Texas at Dallas, Dallas, Texas 75230, April 1976, 10 pages, price 33 cents. UAG-54 "Catalog of Ionosphere Vertical Soundings Data", prepared by Environmental Data Service, NOAA, Boulder, Colorado 80302, April 1976, 130 pages, price $2.10. UAG-55 "Equivalent Ionospheric Current Representations by a New Method, Illustrated for 8-9 November 1969 Magnetic Disturbances", by Y. Kamide, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80302 and Geophysical Institute, University of Alaska, Fairbanks, Alaska 99701, H. W. Kroehl, Data Studies Division, NOAA/EDS/NGSDC, Boulder, Colorado 80302, M. Kanamitsu, Advanced Study Program, National Center for Atmospheric Research, Boulder, Colorado 80303, J. H. Allen, Data Studies Division, NOAA/EDS/NGSDC, Boulder, Colorado 80302, and S.-I. Akasofu, Geophysical Institute, University of Alaska, Fairbanks, Alaska 99701, April 1976, 91 pages, price $1.60. UAG-56 "Iso-intensity Contours of Ground Magnetic H Perturbations for the December 16-18, 1971 Geomagnetic Storm", by Y. Kamide, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80302 and Geophysical Institute, University of Alaska, Fairbanks, Alaska 99701 (currently Guest worker at Data Studies Division, NOAA/EDS/NGSDC, Boulder, Colorado 80302), April 1976, 37 pages, price $1.39. UAG-57 "Manual on Ionospheric Absorption Measurements", edited by K. Rawer, Institut für Physikalische Weltraumforschung, Freiburg, G.F.R., June 1976, 202 pages, price $4.27. UAG-58 "ATS6 Radio Beacon Electron Content Measurements at Boulder, July 1974 - May 1975", by R. B. Fritz, Space Environment Laboratory (currently with Wave Propagation Laboratory), NOAA, Boulder, Colorado 80302 USA, September 1976, 61 pages, price $1.04. UAG-59 "Auroral Electrojet Magnetic Activity Indices AE(11) for 1974", by Joe Haskell Allen, Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service, December 1976, 144 pages, price $2.16. UAG-60 "Geomagnetic Data for January 1976 (AE(7) Indices and Stacked Magnetograms)" by J. H. Allen, C. C. Abston and L. D. Morris, NGSDC/EDS/NOAA, July 1977, 57 pages, price $1.07. UAG-61 "Collected Data Reports for STIP Interval II 20 March - 5 May 1976", edited by Helen E. Coffey and John A. McKinnon, National Geophysical and Solar-Terrestrial Data Center, Environmental Data Service, August 1977, 313 pages, price $2.95. UAG-62 "Geomagnetic Data For February 1976 (AE(7) Indices and Stacked Magnetograms)" by J. H. Allen, C. C. Abston and L. D. Morris, NGSDC/EDS/NOAA, September 1977, 55 pages, price $1.11. UAG-63 "Geomagnetic Data for March 1976 (AE(7) Indices and Stacked Magnetograms)" by J. H. Allen, C. C. Abston and L. D. Morris, NGSDC/EDS/NOAA, September 1977, 57 pages, price $1.11. UAG-64 "Geomagnetic Data for April 1976 (AE(8) Indices and Stacked Magnetograms)" by J. H. Allen, C. C. Abston and L. D. Morris, NGSDC/EDS/NOAA, February 1978, 55 pages, price $1.00. UAG-65 "The Information Explosion and Its Consequences for Data Acquisition, Documentation, and Processing" by G. K. Hartmann, Max-Planck-Institut für Aeronomie, D-3411 Katlenburg-Lindau 3, GFR, May 1978, 36 pages, price 75 cents. UAG-66 "Synoptic Radio Maps of the Sun at 3.3mm 1970-1973" by Earle B. Mayfield, Space Science Lab., and Fred I. Shimabukuro Electronics Res. Lab., The Ivan A. Getting Laboratories, The Aerospace Corp., El Segundo, California 90245, May 1978, 30 pages, price 75 cents. UAG-67 "Ionospheric D-Region Profile Data Base, A Collection of Computer-Accessible Experimental Profiles of the D and Lower E Regions", by L. F. McNamara, Ionospheric Prediction Service, Sydney, Australia, August 1978, 30 pages, price 88 cents. UAG-68 "A Comparative Study of Methods of Electron Density Profile Analysis", by L. F. McNamara, Ionospheric Prediction Service, Sydney, Australia, September 1978, 56 pages, price $1.41. UAG-69 "Selected Disturbed D-Region Electron Density Profiles. Their relation to the undisturbed D region", by L. F. McNamara, Ionospheric Prediction Service, Sydney, Australia, October 1978, 50 pages, price $1.29. UAG-70 "Annotated Atlas of Hα Synoptic Charts for Solar Cycle 20 (1964-1974) Carrington Solar Rotations 1487-1616", by Patrick S. McIntosh, Space Environment Laboratory, ERL/NOAA, February 1979, 327 pages, price $3.50. UAG-71 "Magnetic Potential Plots Over the Northern Hemisphere for 26-28 March 1976", by A.D. Richmond, SEL/ERL/NOAA, H.W. Kroehl, NGSDC/EDIS/NOAA, M.A. Henning, Lockheed Missiles and Space Co., Aurora, CO, and Y. Kamide, Kyoto Sangyo Univ., Kyoto, Japan, April 1979, 115 pages, price $1.50. UAG-72 "Energy Release in Solar Flares, Proceedings of the Workshop on Energy Release in Flares, 26 February-1 March 1979, Cambridge, Massachusetts, U.S.A.", edited by David M. Rust, American Science and Engineering, Inc., Cambridge, MA and A. Gordon Emslie, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, July 1979, 68 pages, price $1.50.