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Ion-acoustic solitons in multi-component plasmas including negative ions at critical densities

Published online by Cambridge University Press:  13 March 2009

Frank Verheest
Frank Verheest
Affiliation:
Instituut voor Theoretische Mechanika, Rijksuniversiteit Gent, Krijgslaan 281, B-9000 Gent, Belgium
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Abstract

Ion-acoustic solitons in a plasma with different adiabatic ion constituents and isothermal electrons are studied via a reductive perturbation method. The basic fluid equations then give rise to KdV or modified KdV equations, depending upon the relative ion densities. At critical densities, rarefactive and compressive fast ion-acoustic solitons are possible. Explicit stationary solutions are discussed in the special case of cold ions, in a plasma containing two species of negative ions and one of positive ions. The inclusion of heavier ions, even at low densities, increases the amplitudes of the critical solitons.

Type
Research Article
Information
Journal of Plasma Physics , Volume 39 , Issue 1 , February 1988 , pp. 71 - 79
Copyright
Copyright © Cambridge University Press 1988

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