Nonplanar solitons in a warm electronegative plasma with electron nonextensivity effects

作者：Shan S Ali^*; Rehman Aman ur

来源：Astrophysics and Space Science, 2014, 352(2): 593-604.

DOI：10.1007/s10509-014-1968-x

• Nonplanar solitons
• Modfied KdV
• Cylindrical and spherical solitons
• Electronegative plasmas

The nonlinear propagation of ion-acoustic waves is studied in an unmagnetized collissionless electronegative plasma, whose constituents are the inertial warm positive/negative ions and q-distributed nonextensive electrons. The latter have strong impact on the linear dispersion relation. However, for nonlinear analysis, a reductive perturbation technique is employed to derive a Korteweg-de Vries (KdV) equation accounting for nonthermal electrons in nonplanar geometries. Numerically, the effects of various plasma parameters, such as, the nonextensive parameter (q), the negative-to-positive ion mass ratio (alpha), the electron-to-positive ion number density ratio (mu), the positive ion-to-electron temperature ratio (theta (i) ) and negative ion-to-electron temperature ratio (theta (n) ), have been examined on the nonplanar compressive/rarefactive fast ion-acoustic solitons (where the wave phase speed is taken as lambda %26gt; 1). The relevance of our findings involving plasma wave excitations should be useful both for space and laboratory plasmas, where two distinct groups of ions besides the electrons, are present.

• 出版日期2014-8