Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22d..06j&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM22D-06
Physics
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2753 Numerical Modeling, 2764 Plasma Sheet, 2788 Storms And Substorms
Scientific paper
The evolution of plasma ejected earthward from a patch of reconnection at about 25 RE is studied using a double-adiabatic-MHD simulation of a thin filament. Firehose instability occurs in the simulation after a compressional shock reflects from the near-Earth region. The tailward-propagating compressional wave, which brakes the earthward flow in the filament, is thus characterized by strong magnetic fluctuations. Within the context of the Near-Earth-Neutral-Line model of substorms, we suggest that firehose instability might cause the intense magnetic-field fluctuations that are observed in the inner plasma sheet at substorm onset. To assess the accuracy of double-adiabatic MHD, we tested it for a situation that resembles the substorm-generated filament but is simple enough to allow an exact kinetic theory solution. The test confirms that double-adiabatic MHD does a reasonable job of predicting when the firehose criterion is satisfied.
Ji Shaolin
Wolf Richard A.
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