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Growth rates of bending KdV solitons

Published online by Cambridge University Press:  13 March 2009

E. W. Laedke  and
K. H. Spatschek
E. W. Laedke
Affiliation:
Fachbereich Physik, Universität Essen, D-4300 Essen, F.R., Germany
K. H. Spatschek
Affiliation:
Fachbereich Physik, Universität Essen, D-4300 Essen, F.R., Germany
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Abstract

Nonlinear ion-acoustic waves in magnetized plasmas are investigated. In strong magnetic fields they can be described by a Korteweg-de Vries (KdV) type equation. It is shown here that these plane soliton solutions become unstable with respect to bending distortions. Variational principles are derived for the maximum growth rate γ as a function of the transverse wavenumber k of the perturbations. Since the variational principles are formulated in complementary form, the numerical evaluation yields upper and lower bounds for γ. Choosing appropriate test functions and increasing the accuracy of the computations we find very close upper and lower bounds for the γ(k) curve. The results show that the growth rate peaks at a certain value of k and a cut-off kc exists. In the region where the γ(k) curve was not predicted numerically with high accuracy, i.e. near the cut-off, we find very precise analytical estimates. These findings are compared with previous results. For k≥kc, stability with respect to transverse perturbations is proved.

Type
Research Article
Information
Journal of Plasma Physics , Volume 28 , Issue 3 , December 1982 , pp. 469 - 484
Copyright
Copyright © Cambridge University Press 1982

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