Electrostatic ion cyclotron velocity shear instability

Details Electrostatic ion cyclotron velocity shear instability Electrostatic ion cyclotron velocity shear instability

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719381l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,381-19,387.

Physics

7

Electrostatic Waves, Ion Cyclotron Radiation, Kelvin-Helmholtz Instability, Magnetic Field Configurations, Magnetohydrodynamic Flow, Plasma Layers, Flow Velocity, Magnetopause, Shear Flow, Shear Layers

Scientific paper

A local electrostatic dispersion equation is derived for a shear flow perpendicular to an ambient magnetic field, which includes all kinetic effects and involves only one important parameter. The dispersion equation is cast in the form of Gordeyev integrals and is solved numerically. Numerical solutions indicate that an ion cyclotron instability is excited. The instability occurs roughly at multiples of the ion cyclotron frequency (modified by the shear), with the growth rate or the individual harmonics overlapping in the wavenumber. At large values of the shear parameter, the instability is confined to long wavelengths, but at smaller shear, a second distinct branch at shorter wavelengths also appears. The properties of the instability obtained are compared with those obtained in the nonlocal limit by Ganguli et al. (1985, 1988).

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