The equatorial latitude of auroral activity during 1972-1977

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

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980soph...67..189s&link_type=abstract

Solar Physics, vol. 67, Aug. 1980, p. 189-206.

Mathematics

Logic

1

Auroras, Geomagnetic Latitude, Magnetic Equator, Meteorological Satellites, Satellite Observation, Coronal Holes, Diurnal Variations, Earth Axis, Earth Rotation, Interplanetary Magnetic Fields, Magnetic Poles, Solar Flares

Scientific paper

The equatorial latitude of auroral activity has been derived from both electron and optical observations with the DMSP satellites. Virtually all of the observations obtained during the five-year interval June 1972-September 1977 have been used to construct a nearly continuous plot of invariant geomagnetic latitude versus time. This plot has two main characteristics: (1) a diurnal variation of approximately plus or minus 5 deg which is 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 deg for intervals of one to several days associated with the occurrence of solar flares and coronal holes. Using a condensed, Bartels-type display of these measurements, it is concluded that: (a) modest auroral expansions (to latitude about 60 deg) occur during the main body of high-speed streams from coronal holes; (b) great expansions (to latitude less than 55 deg) occur only during intervals of intense interplanetary magnetic fields such as may occur at the leading edge of a high-speed stream or at a flare-produced interplanetary shock.

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