Cylindrical and spherical ion-acoustic envelope solitons in multicomponent plasmas with positrons
2009 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 79, no 5, 056402Article in journal (Refereed) PublishedText
The nonlinear wave modulation of planar and nonplanar (cylindrical and spherical) ion-acoustic envelope solitons in a collisionless unmagnetized electron-positron-ion plasma with two-electron temperature distributions has been studied. The reductive perturbative technique is used to obtain a modified nonlinear Schrodinger equation, which includes a damping term that accounts for the geometrical effect. The critical wave number threshold K(c), which indicates where the modulational instability sets in, has been determined for various regimes. It is found that an increase in the positron concentration (alpha) leads to a decrease in the critical wave number (K(c)) until alpha approaches certain value alpha(c) (critical positron concentration), then further increase in alpha beyond alpha(c) increases the value of K(c). Also, it is found that there is a modulation instability period for the cylindrical and spherical wave modulation, which does not exist in the one-dimensional case.
Place, publisher, year, edition, pages
American physical society , 2009. Vol. 79, no 5, 056402
electrons, modulational instability, nonlinear equations, perturbation theory, plasma ion acoustic waves, plasma solitons, plasma temperature, positrons, Schrodinger equation
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:umu:diva-116008DOI: 10.1103/PhysRevE.79.056402ISI: 000266500800063PubMedID: 19518571OAI: oai:DiVA.org:umu-116008DiVA: diva2:905477