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Purely growing electromagnetic modes in high-β plasmas

Published online by Cambridge University Press:  13 March 2009

G. S. Lakhina ,
B. Buti  and
Girija Nayar
G. S. Lakhina
Affiliation:
Physical Research Laboratory, Ahmedabad 380009, India
B. Buti
Affiliation:
Physical Research Laboratory, Ahmedabad 380009, India
Girija Nayar
Affiliation:
Physical Research Laboratory, Ahmedabad 380009, India
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Abstract

Electromagnetic waves propagating transverse to an external magnetic field in a high-β (β being the ratio of the kinetic pressure to the magnetic pressure) plasma become unstable through purely growing modes when β∥e, (electron β parallel to the magnetic field) exceeds a certain minimum value β∥*. For J ≦ 2 (J being the distribution index), the region of instability consists of a single band of unstable wavenumbers k, whereas for J ≥ 3 more than one unstable wave number band may exist. The growth rates are largest for J = 0, and tend to decrease as J increases. The presence of hot ions increases the instability region by exciting a low-frequency instability. This instability gets excited at considerably lowered values of β‖e, and has growth rates of the order of ion cyclotron frequency. The effect of T‖i/T‖e and T‖e/T⊥e is destabilizing, whereas that of T⊥i/T⊥e is stabilizing.

Type
Research Article
Information
Journal of Plasma Physics , Volume 11 , Issue 3 , June 1974 , pp. 461 - 470
Copyright
Copyright © Cambridge University Press 1974

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