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Modified convective cells in plasmas

Published online by Cambridge University Press:  13 March 2009

D. Jovanović ,
H. L. Pécseli ,
J. Juul Rasmussen  and
K. Thomsen
D. Jovanović
Affiliation:
Association EURATOM-Risø National Laboratory, Physics Department, Risø, P.O. Box 49, DK-4000 Roskilde, Denmark
H. L. Pécseli
Affiliation:
Association EURATOM-Risø National Laboratory, Physics Department, Risø, P.O. Box 49, DK-4000 Roskilde, Denmark
J. Juul Rasmussen
Affiliation:
Association EURATOM-Risø National Laboratory, Physics Department, Risø, P.O. Box 49, DK-4000 Roskilde, Denmark
K. Thomsen
Affiliation:
Association EURATOM-Risø National Laboratory, Physics Department, Risø, P.O. Box 49, DK-4000 Roskilde, Denmark
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Abstract

Two coupled equations describing the nonlinear evolution of modified convective cells with a finite but small wavenumber parallel to the external magnetic field B are derived. It is found that, for oblique propagation, the electrostatic and magnetostatic convective mode do not decouple as in the strictly perpen-dicular case. Various aspects of the governing equations are investigated. In the weakly nonlinear lirait, a three-wave interaction study shows the possibility of dual energy cascading, or of cascading to larger wavenumbers only, depending on the direction of the parallel wavenumber component of the pump wave. Furthermore, solitary wave solutions in the form of double vortices are considered.

Type
Research Article
Information
Journal of Plasma Physics , Volume 37 , Issue 1 , February 1987 , pp. 81 - 95
Copyright
Copyright © Cambridge University Press 1987

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References

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