Nonlocal Kinetic Analysis of Plasma Instabilities Relevant to the Onset of Reconnection in the Geomagnetotail Current Sheet

Details Nonlocal Kinetic Analysis of Plasma Instabilities Relevant to the Onset of Reconnection in the Geomagnetotail Current Sheet Nonlocal Kinetic Analysis of Plasma Instabilities Relevant to the Onset of Reconnection in the Geomagnetotail Current Sheet

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42c..05s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM42C-05

Physics

2744 Magnetotail, 2788 Storms And Substorms

Scientific paper

We present the results of a nonlocal kinetic analysis of instabilities responsible for two basic types of magnetic reconnection in the Earth's magnetotail, associated with the formation of X- and Y-lines. We consider in particular the stability of isotropic modified Harris equilibria with nonzero normal component of the magnetic field with respect to tearing mode, which forms the X-line pattern. The problem is solved using the finite element technique and the drift-kinetic description of electrons with additional bounce averaging for the trapped population. It is found that the mode is unstable for typical ion-to-electron temperature ratios if the current sheet is long enough to allow a population of transient electrons. This however is not the case in the near-Earth region. As a result the perturbation of the near-Earth current sheet violates continuity rather then topology and the thin current sheet (TCS) is formed as the central part of the Y-line pattern. We consider the stability of two basic selfconsistent TCS models, isotropic and forced current sheets with respect to perturbations propagating in the dawn-dusk direction using similar finite element technique and nonlocal kinetic description of electron and ion species.

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