Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ap%26ss.338...63b&link_type=abstract
Astrophysics and Space Science, Volume 338, Issue 1, pp.63-72
Astronomy and Astrophysics
Astrophysics
Dusty Plasmas, Dust Charge Variation, Nonthermality, Nonextensivity, Dust Acoustic Waves, Solitons, Shock Waves
Scientific paper
The concept of ion nonthermality is generalized within the theoretical framework of the Tsallis thermostatistics. In this connection, a physically meaningful ion distribution function is outlined. As the nonextensive character of the nonthermal ions increases, the distribution shoulders may become less or more prominent and high energy states are less or more probable than in the extensive nonthermal case. Variable charge dust acoustic waves are then addressed. We first consider the case of adiabatic dust charge variation and discuss later the case when the nonadiabatic charge variations are self-consistently included. Our results may complement and provide new insight into previously published work in nonthermal space plasmas.
Benzekka Moufida
Tribeche Mouloud
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