Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm31b1226h&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM31B-1226
Physics
2731 Magnetosphere: Outer, 2788 Storms And Substorms
Scientific paper
The critical problem in magnetospheric substorm study is the cause of substorm onset. We examined the reoccurrent substorms which well defined with energetic particle data and magnetic data in geosynchronous ground geomagnetic data. 5 events are analyzed. During these events, nearly simultaneous particle flux enhancements and magnetic field variances occurred at geosynchronous, coincided well with the geomagnetic field H-component dramatically decreasing in high latitude nightside regions, which are defined as substorm signatures. With examining IMF data, 4 events occurred when the IMF stayed sustaining southward, but disturbed, One event occurred during relative stable southward IMF. All these events occurred during magnetic storm main phase, and ended at early stage of recovery phase. We find that the reoccurrence substorm onsets are associated with relative change in IMF, especially IMF Bz northward turning. The periods of substorm reoccurrence are 2-3 hour, which dependent on the variances in IMF. Based on present study, we suggest that the necessary condition for substorm onset is enough energy accumulated in magnetotail, leading to an instable magnetotail, external variances in IMF trigger the substorm onset.
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