Electron acoustic solitary waves in a plasma with nonthermal electrons featuring Tsallis distribution

被引:0
作者
Rabia Amour
Mouloud Tribeche
Padma Kant Shukla
机构
[1] University of Bab-Ezzouar,Plasma Physics Group, Theoretical Physics Laboratory, Faculty of Sciences
[2] U.S.T.H.B,Physics
[3] Ruhr-University Bochum,International Centre for Advanced Studies in Physical Sciences, Faculty of Physics and Astronomy
来源
Astrophysics and Space Science | 2012年 / 338卷
关键词
Electron acoustic waves; Soliton; Nonthermal electrons; Tsallis distribution; Nonextensive plasmas;
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学科分类号
摘要
The problem of solitary electron acoustic (EA) wave propagation in a plasma with nonthermal hot electrons featuring the Tsallis distribution is addressed. A physically meaningful nonextensive nonthermal velocity distribution is outlined. It is shown that the effect of the nonthermal electron nonextensivity on EA waves can be quite important. Interestingly, we found that the phase speed of the linear EA mode increases as the entropic index q decreases. This enhancement is weak for q>1, and significant for q<1. For a given nonthermal state, the minimum value of the allowable Mach numbers is lowered as the nonextensive nature of the electrons becomes important. This critical limit is shifted towards higher values as the nonthermal character of the plasma is increased. Moreover, our plasma model supports rarefactive EA solitary waves the main quantities of which depend sensitively on q. This dependency (for q>1) becomes less noticeable as the nonthermal parameter decreases. Nevertheless, decreasing α yields for q<0 a different result, a trend which may be attributed to the functional form of the nonthermal nonextensive distribution. Our study (which is not aimed at putting the ad hoc Cairns distribution onto a more rigorous foundation) suggests that a background electron nonextensivity may influence the EA solitons.
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页码:287 / 294
页数:7
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