Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9416913k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 16913-16923.
Physics
27
Earth Ionosphere, Electrodynamics, Ionospheric Conductivity, Magnetosphere-Ionosphere Coupling, Polar Regions, Solar Terrestrial Interactions, Convection, Electric Potential, Equinoxes, Interplanetary Magnetic Fields, Satellite Observation
Scientific paper
Variations of the northern high-latitude ionospheric convection pattern are estimated from combined ground-based and satellite-based measurements for the disturbed day of September 19, 1984 during the Equinox Transition Study campaign period. Satellite measurements of precipitating particles are incorporated to help determine variations of the conductances in the auroral oval, and these measurements are found to cause substantial modifications to the initial empirical conductance model. A large substorm commenced about 0920 UT and peaked about 1050 UT, followed by smaller substorms starting about 1430 UT and 1800 UT. The polar-cap potential drop varied between about 30 kV and 160 kV during the day, and the integrated Joule heating over the northern polar region varied between 3 x 10 to the 9th W and 8.6 x 10 to the 11th W. Strong eastward convection in the midnight sector of the auroral oval during the first large substorm was associated with a marked westward rotation of the two-cell convection pattern at the substorm peak.
Crowley Geoff
de La Beaujardiere Odile
Friis-Christensen Eigil
Knipp Delores J.
Richmond Arthur D.
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