Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm31a1207m&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM31A-1207
Physics
2704 Auroral Phenomena (2407), 2744 Magnetotail, 2788 Storms And Substorms
Scientific paper
We have studied substorm events under a condition of prolonged northward interplanetary magnetic field (IMF). In substorms on January 19, 1998, a series of expansion onsets and intensifications was observed by Polar UVI. The IMF remained northward for more than 20 hours before the expansion onsets, except for several very short and small southward excursions. During this period, ionospheric convection was very weak. GEOTAIL observed total pressure increases in the magnetotail at -25>X>-30 RE, probably caused by an enhancement in the solar wind dynamic pressure and the large IMF By component. At the substorm onsets, GEOTAIL observed fast tailward flows and southward magnetic fields, associated with plasmoids, suggesting that magnetic reconnection occurred earthward of GEOTAIL. The GOES satellites observed dipolarizations. There were no large changes in the solar wind and the IMF around the onsets. On the basis of these observations, a possible substorm mechanism will be discussed.
Creutzberg F.
Ieda A.
Kamide Yohsuke
Liou Kan
Machida Shiki
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