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Linear density drift instabilities in very low beta plasmas: a different approach

Published online by Cambridge University Press:  13 March 2009

S. Peter Gary
S. Peter Gary
Affiliation:
Earth and Space Science Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

This paper reports a study of the linear Vlasov electromagnetic dispersion equation for density drift instabilities in very low β plasmas. A uniform magnetic field and a weak uniform density gradient are assumed. This paper differs from most other studies of this topic in three important ways: (i) no low-frequency or long-wavelength approximations are made, (ii) no gauge condition is imposed and (iii) a modification of the local approximation is used which is argued to be less arbitrary than the usual local approximation. Numerical solution of the resulting dispersion equation yields stabilization of the universal density drift instability at values of β somewhat higher than those obtained from the local approximation, and near maximum growth shows no evidence of coupling between the universal and Alfvén modes.

Type
Research Article
Information
Journal of Plasma Physics , Volume 30 , Issue 1 , August 1983 , pp. 75 - 94
Copyright
Copyright © Cambridge University Press 1983

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