Fast collisionless tearing in an anisotropic neutral sheet

Details Fast collisionless tearing in an anisotropic neutral sheet Fast collisionless tearing in an anisotropic neutral sheet

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11...12c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, Jan. 1984, p. 12-15. NASA-Navy-supported research.

Physics

9

Collisionless Plasmas, Earth Magnetosphere, Neutral Sheets, Space Plasmas, Tearing Modes (Plasmas), Anisotropy, Geomagnetic Tail, Magnetic Field Configurations, Magnetopause

Scientific paper

The collisionless tearing mode in a neutral sheet is studied in the presence of ion temperature (Ti) anisotropy, using Vlasov description for both ions and electrons. It is found that the growth rate of the instability is significantly enhanced if the ratio of Ti perpendicular to the equilibrium magnetic field to Ti parallel to the field is greater than one. For typical magnetotail parameters with modest temperature anisotropy, it is shown that the linear e-folding time is reduced to a small fraction of the time delays believed to precede the onset of reconnection. This enhancement of the growth rate is due to the Lorentz force acting on the ions that cross the neutral plane, traversing beyond the conventional electron-tearing layer.

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