Understanding Magnetotail Current Sheet Evolution during a Substorm by Using MHD Simulations

Details Understanding Magnetotail Current Sheet Evolution during a Substorm by Using MHD Simulations Understanding Magnetotail Current Sheet Evolution during a Substorm by Using MHD Simulations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1712e&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1712

Physics

2744 Magnetotail, 2753 Numerical Modeling, 2764 Plasma Sheet, 2790 Substorms

Scientific paper

We have investigated the dynamics of the magnetotail current sheet during a substorm that occurred on March 1, 2008 by using global magnetohydrodynamic (MHD) simulations driven by Wind solar wind observation. We have validated the simulation results by comparing them with THEMIS observations in the magnetotail, GEOTAIL observations in the magnetosheath, and GOES-11, and GOES-12 observations at synchronous orbit. During this substorm the THEMIS spacecraft were in conjunction in the dusk side magnetotail. This arrangement provided an excellent data set with which to investigate meso-scale structures in the current sheet. Ground auroral observations have been used to identify an initial intensification of the substorm at 0148UT followed by the main onset at 0155UT [Runov et al., 2008]. Earthward and tailward flows as well as flux ropes were found in both the observations and simulations. We will use our simulation results combined with the observations to investigate the global convection system and current sheet structure during this event. We show how meso-scale structures in the MHD simulations and observations are related to the overall magnetotail dynamics.

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