Physics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..137m&link_type=abstract
Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 137-149.
Physics
47
Interplanetary Magnetic Fields, Magnetic Storms, Polar Caps, Polar Cusps, Polar Substorms, Ring Currents, Auroral Electrojets, Diurnal Variations, Magnetopause, Northern Hemisphere, Southern Hemisphere
Scientific paper
Unusually large latitudinal variations in the polar cusp region observed during three intense geomagnetic storms, which occurred from late 1979 to early 1980, are reported, and the relationship between those cusp variations and the variations in the interplanetary magnetic field, substorm activity, and the ring current intensity is described. It is found that the rapid equatorward shift that occurred during the increase of the ring current growth and during the southward turning of the interplanetary magnetic field orientation is a common feature. The latitude of the cusp closest to the equator is reached before the peak of the ring current intensity by a few to several hours, coinciding with the occurrence of the largest magnitude of the southward interplanetary magnetic field component. The details of the polar cusp latitudinal movement, however, differ from storm to storm.
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