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The ion-ion acoustic instability

Published online by Cambridge University Press:  13 March 2009

S. Peter Gary  and
Nojan Omidi
S. Peter Gary
Affiliation:
Earth and Space Science Division, Los Alamos National Laboratory, Los Alamos, NM 87545
Nojan Omidi
Affiliation:
Instituts of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90024
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Abstract

This paper considers the linear theory of ion-acoustic-like instabilities in a homogeneous Vlasov plasma with two ion components, a less dense beam and a more dense core, with a relative drift velocity. Numerical solutions of the full electrostatic dispersion equation are presented, and the properties of the ion–ion acoustic instability are studied in detail. The following properties are demonstrated: (i) At relatively cold beam temperatures, the instability is fluid-like, but it becomes a beam resonant kinetic instability as the beam temperature becomes of the order of the core temperature; (ii) if the mode is unstable, its threshold lies well below the threshold of the electron–ion acoustic instability; (iii) an electron temperature anisotropy T⊥/T‖e > 1 enhances the instability and (iv) at sufficiently large beam-core relative drift speeds, electron magnetization can either detract from or enhance the instability. If field-aligned ion beams are to drive the ion-acoustic-like enhanced fluctuations observed upstream of the Earth's bow shock, the effective beam temperature must be much smaller than values quoted in the literature.

Type
Research Article
Information
Journal of Plasma Physics , Volume 37 , Issue 1 , February 1987 , pp. 45 - 61
Copyright
Copyright © Cambridge University Press 1987

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