Astrophysics and Space Science

, Volume 331, Issue 1, pp 181–189

Weak ion-acoustic double layers in a plasma with a q-nonextensive electron velocity distribution

Original Article

Abstract

Weak ion-acoustic double-layers (IA-DLs) in a two-component plasma are investigated in the context of the nonextensive statistics proposed by Tsallis. Due to the entropic index q, our plasma model can admit compressive as well as rarefactive IA-DLs. It is shown that the values \(\frac{5}{3}<q<3\) are automatically ruled out from the domain of allowable nonextensive q-parameters for the existence of small-DLs. As long as the Mach number M is less than ∼1.42, the only admissible q-values which may lead to IA-DLs are all positive. For −1<q<1 (1<q<5/3), the effect of increasing q is to lower (to shift towards higher values) the critical Mach number Mcr above which only compressive IA-DL are admitted. Beyond q=3, only compressive small-amplitude ion-acoustic double layers are observed. Furthermore, due to the flexibility of the q-parameter, the obtained results bring a possibility to deal with small-DLs with relatively high Mach numbers. Our investigation may be of wide relevance to astronomers and space scientists working on interstellar plasmas.

Keywords

Boltzmann-Gibbs thermostatistics Long-range interactions systems Nonextensivity Tsallis statistical mechanics Double layers Auroral acceleration region Earth’s magnetosphere Plasma sheet Field-aligned acceleration of particles 

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Faculty of Sciences-Physics, Theoretical Physics Laboratory (TPL)University of Bab-Ezzouar, U.S.T.H.BAlgiersAlgeria

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