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Nonlinear generation of the fundamental radiation in plasmas: the influence of induced ion-acoustic and Langmuir waves

Published online by Cambridge University Press:  13 March 2009

F. B. Rizzato
Affiliation:
Institute of Physics, Federal University of Rio Grande do Sul, P.O. Box 15051, 91500 Porto Alegre, RS, Brazil
A. C.-L. Chian
Affiliation:
National Institute for Space Research – INPE, P.O. Box 515, 12201 São José dos Campos, SP, Brazil

Abstract

A nonlinear emission mechanism of electromagnetic waves at the fundamental plasma frequency has been examined by Chian & Alves. This mechanism is based on the electromagnetic oscillating two-stream instability driven by two oppositely propagating Langmuir waves. The excitation of the electromagnetic oscillating two-stream instability is due to nonlinear wave–wave coupling involving Langmuir waves, low-frequency density waves and electromagnetic waves. In this paper the Chian & Alves model is improved using the generalized Zakharov equations. Attention is directed toward the influence of induced low-frequency and Langmuir waves on the properties of the electromagnetic oscillating two-stream instability. Presumably, the properties derived in the present context may be relevant to both space and laboratory plasmas.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1992

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