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Nyquist diagrams for low-frequency oscillations in a non-uniform magnetoplasma

Published online by Cambridge University Press:  13 March 2009

Bruno Bertotti  and
Aldo Nocentini
Bruno Bertotti
Affiliation:
Laboratorio dei Gas Ionizzati, Euratom-CNEN, Frascati, Roma, Italy
Aldo Nocentini
Affiliation:
Laboratorio dei Gas Ionizzati, Euratom-CNEN, Frascati, Roma, Italy
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Abstract

A modification of the Penrose criterion is applied to the local dispersion relation for low-frequency, electrostatic instabilities in a low-density, slightly inhomogeneous magnetoplasma. The Nyquist diagrams obtained can be classified according to their behaviour near the origin; this is sufficient in some cases to conclude that the equilibrium is unstable. With this method, in the limit of negligible ion Larmor radius, we find that the Langmuir waves propagating in a direction orthogonal to the external magnetic field are driven unstable by a temperature gradient.

Type
Research Article
Information
Journal of Plasma Physics , Volume 2 , Issue 2 , June 1968 , pp. 135 - 143
Copyright
Copyright © Cambridge University Press 1968

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References

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