Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1713z&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1713
Physics
2744 Magnetotail, 2753 Numerical Modeling, 2764 Plasma Sheet, 2790 Substorms
Scientific paper
On March 23, 2007 the THEMIS satellite constellation provided us with a unique opportunity to study substorm injection in the region beyond geosynchronous orbit. On March 23 all five THEMIS spacecraft observed substorm injection in the near earth tail (X~-7RE). We have used the THEMIS observations to examine magnetic field dipolarization and plasma bulk flow. We have carried out large scale kinetic simulations in which we traced the trajectories of millions of ions in the time dependent magnetic field and electric fields obtained from a global MHD simulation of this substorm. These particles were launched before substorm onset earthward of the X-line with drifting Maxwellian distributions. The results reproduce the dispersionless energetic particle fluxes observed by THEMIS. We will investigate the mechanism by which the particles gain energy during the substorm process. We also will compare the results with Maxwellian distributions with those from launches in which we initialized the particles with kappa distributions.
Angelopoulos Vassilis
Ashour-Abdalla Maha
Deng Xinghua
El-Alaoui Mostafa
Peroomian Vahé
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