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Arbitrary amplitude dust-acoustic solitons in a weakly non-ideal plasma with non-thermal ions

Published online by Cambridge University Press:  01 October 2007

S. K. MAHARAJ ,
R. BHARUTHRAM  and
S. R. PILLAY
S. K. MAHARAJ
Affiliation:
Hermanus Magnetic Observatory, Hermanus, 7200, South Africa
R. BHARUTHRAM
Affiliation:
University of the Witwatersrand, Johannesburg, South Africa (bharuthramr@science.wits.ac.za)
S. R. PILLAY
Affiliation:
University of KwaZulu-Natal, Durban, 4000, South Africa
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Abstract

The nonlinear propagation of the dust-acoustic wave is investigated in a weakly non-ideal plasma comprising Boltzmann electrons, non-thermal ions characterized by a non-thermal parameter α and a negatively charged dust fluid. The non-ideal dust fluid is represented by the van der Waals equation of state. Arbitrary amplitude soliton solutions are found to occur for both supersonic and subsonic values of the Mach number. Upper and lower limits of the range of values of α for which solitons exist are examined as a function of the non-ideal parameters associated with the effects of volume reduction and the cohesive forces, for both the supersonic and subsonic cases.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 5 , October 2007 , pp. 671 - 686
Copyright
Copyright © Cambridge University Press 2007

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