Streaming sausage, kink and tearing instabilities in a current sheet with applications to the earth's magnetotail

Details Streaming sausage, kink and tearing instabilities in a current sheet with applications to the earth's magnetotail Streaming sausage, kink and tearing instabilities in a current sheet with applications to the earth's magnetotail

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.7354l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, July 1, 1988, p. 7354-7365.

Computer Science

Numerical Analysis

34

Current Sheets, Geomagnetic Tail, Kelvin-Helmholtz Instability, Magnetohydrodynamic Flow, Shear Flow, Tearing Modes (Plasmas), Geomagnetism, International Sun Earth Explorers, Numerical Analysis, Solar Wind

Scientific paper

This paper investigates the growth rates and eigenmode structures of the streaming sausage, kink, and tearing instabilities in a current sheet with a super-Alfvenic flow. The growth rates and eigenmode structures are first considered in the ideal incompressible limit by using a four-layer model, as well as a more realistic case in which all plasma parameters and the magnetic field vary continuously along the direction perpendicular to the magnetic field and plasma flow. An initial-value method is applied to obtain the growth rate and eigenmode profiles of the fastest growing mode, which is either the sausage mode or kink mode. It is shown that, in the earth's magnetotail, where super-Alfvenic plasma flows are observed in the plasma sheet and the ratio between the plasma and magnetic pressures far away from the current layer is about 0.1-0.3 in the lobes, the streaming sausage and streaming tearing instabilities, but not kink modes, are likely to occur.

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