Firehose instability near substorm expansion-phase onset?

Details Firehose instability near substorm expansion-phase onset? Firehose instability near substorm expansion-phase onset?

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30xssc5j&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 24, pp. SSC 5-1, CiteID 2242, DOI 10.1029/2003GL017981

Physics

2

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Convection, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Storms And Substorms

Scientific paper

The evolution of plasma ejected earthward from a patch of reconnection at ~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 characterized by strong magnetic fluctuations. Within the context of the Near-Earth-X-Line model of substorms, we suggest that firehose instability might cause the intense magnetic-field fluctuations observed in the inner plasma sheet at substorm onset.

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