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Electrostatic ion cyclotron velocity shear instabilityA 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).
Document ID
19930037003
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lemons, D. S.
(NASA Headquarters Washington, DC United States)
Winske, D.
(NASA Headquarters Washington, DC United States)
Gary, S. P.
(Los Alamos National Lab. NM, United States)
Date Acquired
August 16, 2013
Publication Date
December 1, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: A12
ISSN: 0148-0227
Subject Category
Plasma Physics
Accession Number
93A21000
Distribution Limits
Public
Copyright
Other

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