Substorm Dynamics: THEMIS Data and OpenGGCM Simulations

Details Substorm Dynamics: THEMIS Data and OpenGGCM Simulations Substorm Dynamics: THEMIS Data and OpenGGCM Simulations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm51c..05r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM51C-05

Physics

2764 Plasma Sheet, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

THEMIS has now completed its first tail season and thus has collected data on a substantial number of substorm events. In addition, THEMIS also observed substorms during the commissioning pahase in February and March of 2007. Outstanding among these events were the March 23, 2007 "first light" substorm, and the February 26, 2008 event that was recently analyzed in a Science article. In this presentation we augment the data analysis with OpenGGCM global magnetosphere simulations. We show that the simulations reproduce the salient features of these substorms such as the westward traveling surge and dipolarization of the tail magnetic field. We conclude that the simulations are generally consistent with the Near-Earth Neutral Line substorm model; however, OpenGGCM simulations suggest that tail reconnection is much more fragmented and does not occur at a single x-line.

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