Substorm trigger conditions

Details Substorm trigger conditions Substorm trigger conditions

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...10422745h&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A10, p. 22745-22758

Physics

23

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Storms And Substorms

Scientific paper

Critical conditions for the onset of fast interchange dynamics in the stressed geotail during the growth phase of the substorm are derived. We compare the ideal MHD interchange stability condition [Hurricane, 1997] with that for kinetically modified interchange-ballooning motions. It is shown that fast interchange growth is possible only in the near-Earth boundary of the plasma sheet where the local plasma pressure-to-magnetic pressure ratio (beta) is near unity since compressibility stabilizes the high-β geotail. The growth rate is proportional to the local current density and exceeds the ion bounce frequency in the local region of β<~1. Only after sufficient thinning of the current sheet will the kinetic theory growth rate exceed the bounce frequency of the ions, which is the effective condition for the substorm MHD-space-timescale unloading of the plasma energy stored in the geotail.

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