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Current driven electromagnetic ion cyclotron instability

Published online by Cambridge University Press:  13 March 2009

D. W. Forslund ,
J. M. Kindel  and
M. A. Stroscio
D. W. Forslund
Affiliation:
Los Alamos Scientific Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545
J. M. Kindel
Affiliation:
Los Alamos Scientific Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545
M. A. Stroscio
Affiliation:
Los Alamos Scientific Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545
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Abstract

When an electron distribution drifts relative to the ions along a d.c. magnetic field, it is known that, above some critical drift velocity, a nearly field-aligned electromagnetic ion cyclotron instability may be excited. We extend the study of this instability over wide variations in plasma parameters, ion β in particular, and beyond marginal stability.Above threshold the most unstable waves propagate very obliquely to the ambient d.c. magnetic field at wavenumbers of the order of an inverse ion Larmor radius. At low ion β the critical electron drift normalized to the ion thermal velocity scales inversely as β i- ½ while, for β i>10-2, the critical drift scales as the ion thermal velocity. For the Te≈Tielectromagnetic ion cyclotron instabifity begins to have a lower threshold than the corresponding electrostatic instability at β i≈me/Mi. In a moderately high β i, homogeneous, collisionless plasma the electromagnetic ion cyclotron instability appears to have the lowest threshold of any current driven instability.

Type
Research Article
Information
Journal of Plasma Physics , Volume 21 , Issue 1 , February 1979 , pp. 127 - 139
Copyright
Copyright © Cambridge University Press 1979

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