Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.3945w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 3945-3951.
Physics
19
Auroral Electrojets, Earth Magnetosphere, Electric Fields, Polar Caps, Polar Substorms, Satellite Observation, Atmospheric Electricity, Interplanetary Magnetic Fields
Scientific paper
Double-probe electric field measurements on the DE2 satellite are used to obtain 148 measurements of the polar cap potential drop and size at random times preceding, during, and after 64 substorms. The polar cap potentials are graphed as a function of the difference between the time of the polar cap measurement and the time of the expansion onset of the corresponding substorm. The ratios of the AE indices and the potential are also determined. It is shown that, on average, the polar cap potential starts to increase at 1.5 hr before onset, reaches a level of 70 kV in the 30-min period before onset, and starts to decline at 1.5 hr after onset. The size of the polar cap ranged from 23 to 38 deg invariant latitude at the time of onset, and had an average value of 31 deg.
Akasofu Syuh-Ichi
Kan Joseph R.
Weimer Daniel R.
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