Nonextensive dust acoustic waves in a charge varying dusty plasma |
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Authors: | Mustapha Bacha Mouloud Tribeche |
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Institution: | 1. Plasma Physics Group, Theoretical Physics Laboratory, Faculty of Sciences-Physics, University of Bab-Ezzouar, USTHB, B.P. 32, El Alia, Algiers, 16111, Algeria
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Abstract: | Our recent analysis on nonlinear nonextensive dust-acoustic waves (DA) Amour and Tribeche in Phys. Plasmas 17:063702, 2010]
is extended to include self-consistent nonadiabatic grain charge fluctuation. The appropriate nonextensive electron charging
current is rederived based on the orbit-limited motion theory. Our results reveal that the amplitude, strength and nature
of the nonlinear DA waves (solitons and shocks) are extremely sensitive to the degree of ion nonextensivity. Stronger is the
electron correlation, more important is the charge variation induced nonlinear wave damping. The anomalous dissipation effects
may prevail over that dispersion as the electrons evolve far away from their Maxwellian equilibrium. Our investigation may
be of wide relevance to astronomers and space scientists working on interstellar dusty plasmas where nonthermal distributions
are turning out to be a very common and characteristic feature. |
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