The equatorial latitude of auroral activity during 1972-1977
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The equatorial latitude of auroral activity during 1972-1977

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  • Description:
    The equatorial latitude of auroral activity has been derived from both electron and optical observations with the DMSP satellites. Essentially all of these observations have been used to produce a nearly continuous plot of invariant geomagnetic latitude versus time during the 5-year interval June 1972 - September 1977. This plot has two main characteristics: (1) a diurnal variation of approximately ±5° which is somehow associated with the precession of the Earth's magnetic dipole axis about the Earth's rotation axis and (2) an irregular variation of roughly 5-10° for intervals of one to several days associated with the occurrences of solar flares and coronal holes. With the help of a condensed, Bartels-type display of these measurements, we conclude that (1) modest auroral expansions (to [lambda] ~ °) occur during the main body of high-speed streams from coronal holes and (2) great expansions (to [lambda] < 55°) occur at the leading edge of a high-speed stream or at a flat-produced interplanetary shock.
  • Content Notes:
    by N.R. Sheeley, Jr. and R.A. Howard and B.S. Dandekar.

    "E.O. Hulbert Center for Space Research, US Naval Research Laboratory."

    "Air Force Geophysics Laboratory."

    "October 1980."

    Also available online in PDF.

    Includes bibliographical references (page 8).

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