Global ionospheric current distributions during substorms

Details Global ionospheric current distributions during substorms Global ionospheric current distributions during substorms

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.1613a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, March 1, 1984, p. 1613-1625.

Physics

23

Auroral Electrojets, Current Distribution, Ionospheric Currents, Polar Substorms, Synoptic Measurement, Data Acquisition, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Measurement

Scientific paper

The growth and decay of a number of substorms are examined in terms of ionospheric currents over the entire polar region using the procedure described by Kamide et al. (1982). The time sequential picture of the ionospheric current distribution over the entire polar region is shown for several magnetospheric substorms. It is found that during a quiet period, currents are often present in the cusp and/or polar cap regions. The cusp current comprises a pair of east-west currents and the polar cap current consists of a number of vortices. When the interplanetary magnetic field Bz component is positive but decreasing in magnitude, a well-defined westward electrojet forms in the midnight sector. This development, however, is not evident in the AE index. A gradual but distinct growth in the AE index is seen as the intensification of a weak substorm current system which is accompanied by typical auroral substorm features. The subsequent sharp increase in the AE index is found to arise primarily from a deep intrusion of the westward electrojet into the premidnight sector and its equatorward shift.

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