Interaction between kinetic ballooning perturbation and thin current sheet: Quasi-electrostatic field, local onset, and global characteristics

Details Interaction between kinetic ballooning perturbation and thin current sheet: Quasi-electrostatic field, local onset, and global characteristics Interaction between kinetic ballooning perturbation and thin current sheet: Quasi-electrostatic field, local onset, and global characteristics

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3520107l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 20, CiteID L20107

Physics

7

Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Electric Fields (2411), Magnetospheric Physics: Substorms, Magnetospheric Physics: Magnetic Storms And Substorms (7954)

Scientific paper

We present observation of plasma waves in the current sheet across multiple THEMIS satellites in a substorm event on March 5, 2008. It is shown that the arrival of a kinetic ballooning perturbation interacts with the local current sheet to generate a quasi-electrostatic wave a few minutes before local onset, consistent with the prediction that the current sheet thins after the passage of a rarefaction wave. The propagation speed of current disruption front is found to be ~100 km/s, about a tenth of the fast mode speed. The observed pattern of interaction was constant across radial distances between 10 and 20 R E in the event reported. It is further proposed that the presence of the quasi-electrostatic field may change the local stability condition and induce local current disruption.

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