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Dust-acoustic solitary waves in a finite temperature dusty plasma with variable dust charge and two temperature ions

Published online by Cambridge University Press:  27 July 2004

TARSEM SINGH GILL
Affiliation:
Department of Physics, Guru Nanak Dev University, Amritsar-143005, India
HARVINDER KAUR
Affiliation:
Department of Physics, Khalsa College, Amritsar-143002, India (nspst99@yahoo.com)
NARESHPAL SINGH SAINI
Affiliation:
Department of Physics, Guru Nanak Dev University, Amritsar-143005, India

Abstract

In this paper, the characteristics of dust-acoustic solitary waves in dusty plasma are studied. Dust charge and temperature are treated as variables. The authors have used the pseudopotential method to investigate the possibility of compressive as well as rarefactive solitons. An expression for the pseudopotential has been derived. The pseudopotential is a function of the Mach number, the relative temperature of low and high ion components, the relative ion concentration of dust charge and the temperature. Numerical computation shows that for the chosen set of parameters, only compressive solitons exist and their amplitudes increase with increasing Mach number. An increase in the dust temperature results in the disappearance of the compressive soliton. It is the only small parameter regime where compressive as well rarefactive solitons coexist. The effect of the relative ion temperature on solitons is also investigated. In the small amplitude limit, an increase in the dust temperature leads to a transition from compressive to rarefactive solitons.

Type
Papers
Copyright
© 2004 Cambridge University Press

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