Nonplanar shocks in a warm electronegative plasma with electron nonextensivity effects
| Autor: | Shahid Ali, S. Ali Shan, Aman-ur-Rehman |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Astrophysics and Space Science. 353:151-162 |
| ISSN: | 1572-946X 0004-640X |
| Popis: | 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 (α), the electron-to-positive ion number density ratio (μ), the positive ion-to-electron temperature ratio (θi) and negative ion-to-electron temperature ratio (θn), have been examined on the nonplanar compressive/rarefactive fast ion-acoustic solitons (where the wave phase speed is taken as λ>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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|