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Ion-acoustic solitons in plasmas with two adiabatic constituents†

Published online by Cambridge University Press:  18 December 2009

FRANK VERHEEST  and
MANFRED A. HELLBERG
FRANK VERHEEST
Affiliation:
Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, B-9000 Gent, Belgium (Frank.Verheest@UGent.be) School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
MANFRED A. HELLBERG
Affiliation:
School of Physics, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
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Abstract

Large amplitude ion-acoustic solitons are treated by a Sagdeev pseudopotential analysis, in a plasma with two adiabatic constituents, with the full inclusion of inertial and pressure effects for both. The sign of the supersonic species determines the polarity of the solitons, which are compressive in both constituents. Emphasis is placed on the determination of the soliton existence domains in compositional parameter space, allowing correct Sagdeev pseudopotential graphs to be easily generated, and offering insight into why limitations occur. Soliton velocities are bounded from below by the true acoustic velocity in the plasma model, and from above by the breakdown of the description when the supersonic ions reach their sonic point. Increases in the mass density ratio and the soliton velocity or decreases in the temperature ratio lead to increases in soliton amplitudes and decreases of the widths. Applications include hydrogen and electron–positron plasmas, and various kinds of dusty plasmas.

Type
Papers
Information
Journal of Plasma Physics , Volume 76 , Special Issue 3-4: In Honor of Professor Padma Kant Shukla on the Occasion of His 60th Birthday , August 2010 , pp. 277 - 286
Copyright
Copyright © Cambridge University Press 2009

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