| Atlas of stackplots derived from solar synoptic charts : evolution of large-scale magnetic fields and coronal holes from H[alpha] synoptic charts : 1966-1987 - :1370 | National Environmental Satellite and Data Information Service (NESDIS)
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Atlas of stackplots derived from solar synoptic charts : evolution of large-scale magnetic fields and coronal holes from H[alpha] synoptic charts : 1966-1987
  • Published Date:
    1991
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Atlas of stackplots derived from solar synoptic charts : evolution of large-scale magnetic fields and coronal holes from H[alpha] synoptic charts : 1966-1987
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  • Corporate Authors:
    World Data Center A for Solar-Terrestrial Physics ; National Geophysical Data Center ;
  • Description:
    Long-lived patterns of solar magnetic-field polarity and coronal holes are revealed in a collection of stackplots - vertical time series of segments of solar synoptic charts. The plots, based upon a 21-year collection of H[alpha] synoptic charts compiled at the Space Environment Laboratory (SEL) of the National Oceanic and Atmospheric Administration, portray the long-term, large-scale evolution of solar magnetic features from late on 1966 through to the end of 1987. This interval includes two complete sunspot cycles (most of cycles 20 and 21, and the start of cycle 22). Coronal hole data are available from the x-ray images obtained by Skylab (1973-74) and from HeI [lambda]10830 observations for 1975-1987. Several types of stackplot are included in this collection. These include a series of plots displaying 10� zones of solar latitude, stepped from 70�N through the solar equator to 70�S. Three further series of stackplots show a wider bad of latitude (1�N-50�N, 25�S-25�N, 1�S-50�S). Two types of large scale plots are also included, both being formed from the 10� latitude zones. The first combines data from each 10� zone for the entire interval of time. The second, a fold-out page, combines the data from all zones to provide an overview of the entire 21-year database. The stackplots are extensively cross referenced by date, rotation number, and latitude range to allow researchers easy access to periods of special interest. The plots are also accompanied by overlays and grids to measure rotation rate of drifting patterns. Applications for these data include: studies of variable rates of rotation for magnetic field and coronal hole patterns; inference of the general circulation of the solar atmosphere; definition of the solar cycle from large-scale parameters, independent of sunspots; improved studies of the reversal of polar magnetic fields; and meridional motions of large-scale features.

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