Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ap%26ss.337..253b&link_type=abstract
Astrophysics and Space Science, Volume 337, Issue 1, pp.253-259
Astronomy and Astrophysics
Astrophysics
1
Dust Acoustic Waves, Nonadiabatic Dust Charge Fluctuation, Tsallis Entropy, Nonextensivity, Solitary Waves, Noncollisional Shock Waves, Anomalous Damping
Scientific paper
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.
Bacha Mustapha
Tribeche Mouloud
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