Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0571c&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0571
Physics
2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2753 Numerical Modeling, 2764 Plasma Sheet, 2788 Storms And Substorms
Scientific paper
Based on the AMPTE/CCE observations [Cheng and Lui, GRL, 1998], a low frequency instability with period on the order of 1 min is observed about 2-3 minutes before the substorm onset and is identified as a kinetic ballooning instability. Kinetic effects such as ion gyroradii, magnetic drift, and trapped electrons can strongly enhance the beta threshold over that of ideal MHD ballooning mode theory prediction. However, the ballooning instability threshold based on the ideal MHD model in realistic magnetospheres is still unresolved. Here, we present the stability property of ideal MHD ballooning modes in numerical 3D magnetospheric equilibria with thin current sheet. The coupling effects between perpendicular and parallel (compressional) perturbed magnetic fields are included. The calculations make use of numerical 3D magnetospheric equilibria including thin current sheet by assuming pressure to be constant along a field line. We then, estimate the stability threshold including kinetic effects and compare with observations.
Cheng C. Z.
Zaharia Sorin
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