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Nonlinear transient signal propagation in homogeneous plasma

Published online by Cambridge University Press:  13 March 2009

D. Jovanović
Affiliation:
Association Euratom-Risø National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark
H. L. Pécseli
Affiliation:
Association Euratom-Risø National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark
K. Thomsen
Affiliation:
Association Euratom-Risø National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark

Abstract

The nonlinear transient evolution of a suddenly applied monochromatic wave in a homogeneous plasma is considered, with particular emphasis on the magnetized case, where ordinary and extraordinary electromagnetic waves travelling normal to B are treated. Two important features are described. First, the penetration of the wave front is shown to be accompanied by ‘radiation’ of low-frequency waves, of which ion cyclotron and lower-hybrid waves are considered here. Next, the presence of a nonlinear, second-harmonic precursor is predicted, containing two natural modes of oscillation, one with exactly twice the frequency of the fundamental, and the other a slightly frequency-shifted contribution. The analysis is readily generalized to waves other than those considered here.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1982

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