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Three-dimensional instability of two nonlinearly coupled electromagnetic waves in a plasma

Published online by Cambridge University Press:  01 June 2008

LENNART STENFLO ,
BENGT ELIASSON  and
MATTIAS MARKLUND
LENNART STENFLO
Affiliation:
Department of Physics, Umeä University, SE-901 87 Umeä, Sweden ([email protected])
BENGT ELIASSON
Affiliation:
Department of Physics, Umeä University, SE-901 87 Umeä, Sweden ([email protected])
MATTIAS MARKLUND
Affiliation:
Department of Physics, Umeä University, SE-901 87 Umeä, Sweden ([email protected])
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Abstract

The three-dimensional instability of two coupled electromagnetic waves in an unmagnetized plasma is investigated theoretically and numerically. In the regime of two-plasmon decay, where one pump wave frequency is approximately twice the electron plasma frequency, we find that the coupled pump waves give rise to enhanced instability with wavevectors between those of the two beams. In the case of ion parametric decay instability, where the pump wave decays into one Langmuir wave and one ion acoustic wave, the instability regions are added with no distinct amplification. Our investigation can be useful in interpreting laser-plasma as well as ionospheric heating experiments.

Type
Papers
Information
Journal of Plasma Physics , Volume 74 , Issue 3 , June 2008 , pp. 371 - 379
Copyright
Copyright © Cambridge University Press 2007

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