Is the earth's magnetotail balloon unstable?

Details Is the earth's magnetotail balloon unstable? Is the earth's magnetotail balloon unstable?

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719251l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,251-19,257.

Physics

46

Current Sheets, Geomagnetic Tail, Magnetic Storms, Magnetohydrodynamic Stability, Plasma Layers, Two Dimensional Models, Boundary Conditions, Earth Magnetosphere, Tearing Modes (Plasmas)

Scientific paper

In the past, the onset of magnetospheric substorms has been attributed to the plasma tearing mode instabilities. This paper investigates the ideal MHD ballooning instability of the near-and middle-tail magnetosphere region, as a first step toward determining whether it could trigger the tearing mode, by using the energy principle to investigate whether standard 2D tail models with the 'hard' ionospheric boundary condition are unstable to ballooning instability. Numerical results are presented for compressible ballooning modes that are symmetric about the center of the current sheet. It is shown that, for such a hard boundary condition, no reasonable magnetotail configuration exists that would be unstable to compressible symmetric ballooning but stable against interchange.

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