Nonlocal kinetic linear stability analysis of current driven instabilities in thin current sheets

Details Nonlocal kinetic linear stability analysis of current driven instabilities in thin current sheets Nonlocal kinetic linear stability analysis of current driven instabilities in thin current sheets

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42d..06s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM42D-06

Physics

2744 Magnetotail, 2772 Plasma Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

Current driven instabilities such as the drift-kink and lower-hybrid drift instabilities have been considered for a long time as promising mechanisms of substorm onset and reconnection in the tail of Earth's magnetosphere. However, recent nonlocal kinetic stability studies [Daughton, 1998, 1999] found that for realistic ion-to-electron mass ratio and Harris equilibrium the growth rates of the appropriate plasma eigenmodes are too small to explain the substorm onset. This conclusion may alter however for current sheets with bulk flow velocity shear or two component ion species. Both these properties are distinctive features of a new family of self-consistent models of thin current sheets (TCS), where the magnetic field line tension is balanced by the ion inertia rather than by the pressure gradient [Sitnov et al., 2000]. We present the results of the nonlocal kinetic stability analysis of these TCS equilibria with respect to current driven instabilities. The analysis is based on the finite element approach to stability problem and the appropriate code has been benchmarked using the previous results on the Harris sheet stability [Daughton, 1998, 1999].

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