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Lower-hybrid instabilities driven by an ion velocity ring

Published online by Cambridge University Press:  13 March 2009

K. Akimoto ,
K. Papadopoulos  and
D. Winske
K. Akimoto
Affiliation:
Department of Physics and Astronomy, University of Maryland, College Park, MD 20742
K. Papadopoulos
Affiliation:
Department of Physics and Astronomy, University of Maryland, College Park, MD 20742
D. Winske
Affiliation:
Applied Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

The lower-hybrid instabilities in high-beta (ratio of plasma to magnetic pressure) plasmas driven by ring-ion distributions in velocity space are investigated. A dispersion equation including electromagnetic effects is derived. In the low-beta limit, analytic expressions are obtained which illuminate the physical nature of the instabilities. The complete dispersion equation is solved numerically as a function of ring speed and plasma beta for several types of ring distribution. Electromagnetic effects are important for relatively energetic rings even in the low-beta regime, suppressing growth rates and shifting the angle of propagation to more oblique angles. Stabilization by thermal effects is also discussed. Application of these results to the Earth's bow shock, AMPTE, comets and solar flares is suggested.

Type
Research Article
Information
Journal of Plasma Physics , Volume 34 , Issue 3 , December 1985 , pp. 445 - 465
Copyright
Copyright © Cambridge University Press 1985

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