Dynamics of the Near Earth Plasma Sheet During two Substorms

Details Dynamics of the Near Earth Plasma Sheet During two Substorms Dynamics of the Near Earth Plasma Sheet During two Substorms

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31a0744e&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM31A-0744

Physics

2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

Spacecraft observations and results from global magnetohydrodynamic (MHD) simulations were used to analyze two substorm events, one that occurred on September 4, 1996, and one that occurred on July 2, 1996. During the September 4 event the IMF By was directed dawnward with a magnitude of 7 nT. At about 2135 UT on that day, GEOTAIL was located on the dawnside and observed a tailward flow that was accompanied by a negative Bz magnetic-field component. During the July 2 event the IMF was duskward with a magnitude of 10 nT. During this event GEOTAIL was located on the dusk side. GEOTAIL measured plasma sheet parameters throughout the expansion phase of these substorms. Measurements taken upstream of the Earth by the Wind spacecraft, during each of these events, were used as input to MHD simulations. After assessing the validity of the models' results by comparing simulated time series with GEOTAIL and Polar observations, we consider the time evolution of the plasma sheet. During the September 4 case the calculated power seemed to correlate well with upstream conditions, while during the July 2 case there were large scale variations in the calculated power that did not seem to relate to any IMF variations. We examine the response of the magnetotail topology to dawn and dusk IMF to understand this distinction.

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