Limits on plasma anisotropy in a tail-like magnetic field

Details Limits on plasma anisotropy in a tail-like magnetic field Limits on plasma anisotropy in a tail-like magnetic field

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2441h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 24, p. 2441-2444.

Physics

10

Anisotropy, Current Sheets, Geomagnetic Tail, Magnetic Field Configurations, Magnetohydrostatics, Plasma Pressure, Collisionless Plasmas, Gyrotropism

Scientific paper

The condition of magnetohydrostatic equilibrium implies tight constraints on the degree of anisotropy that is supportable in a magnetotail field geometry. If the plasma pressure tensor is assumed to be gyrotropic at the tail midplane (z = 0), then equilibrium requires that it also be nearly isotropic there, with P-perpendicular0/P-parallel sub 0 in the range 1 +/- delta square, where delta of about 0.1 is the ratio of the normal field component at the symmetry plane to the field strength in the tail lobe. The upper and the lower limits are essentially equivalent, respectively, to the marginal mirror and firehose stability conditions evaluated at z = 0, which have been invoked previously to limit the degree of anisotropy in the plasma sheet.

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