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Effect of superthermal electrons on dust-acoustic shock waves in coupled dusty plasmas

Published online by Cambridge University Press:  12 November 2012

HAMID REZA PAKZAD
Affiliation:
Department of Physics, Mashhad Branch, Islamic Azad University, Mashhad, Iran
MOULOUD TRIBECHE
Affiliation:
Theoretical Physics Laboratory, Plasma Physics Group, Faculty of Physics, University of Bab-Ezzouar, USTHB, BP 32, El Alia, Algiers 16111, Algeria ([email protected])

Abstract

Nonlinear dust-acoustic (DA) shock waves in coupled dusty plasmas with negative dust grains and kappa-distributed electrons are discussed. Using a generalized hydrodynamic model, the dispersion relation and the Korteweg–de Vries-Burger (KdVB) equation for low-frequency DA modes in a strongly coupled dusty plasma are derived. The dependence of shock waves on various plasma parameters is then explored. A solitonic profile may be converted into a shock structure when correlation among dust particles becomes stronger. The amplitude as well as the steepness of shock waves increases with increasing the value of the spectral index k.

Type
Papers
Copyright
Copyright © Cambridge University Press 2012

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