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On the generation of envelope solitons in the presence of excess superthermal electrons and positrons
Umeå University, Faculty of Science and Technology, Department of Physics.
2011 (English)In: Astrophysics and Space Science, ISSN 0004-640X, E-ISSN 1572-946X, Vol. 333, no 1, 203-208 p.Article in journal (Refereed) Published
Abstract [en]

A theoretical model is presented to investigate the existence, formation, and possible realization of nonlinear envelope ion acoustic solitary waves which accompany collisionless electron-positron-ion plasmas with high-energy electrons and positrons (represented by kappa distribution). By employing the reductive perturbation method, the hydrodynamic model and the Poisson equation are reduced to nonlinear Schrodinger equation. The effects of the superthermal parameters, as well as ion-to-electron temperature ratio on the propagation and stability of the envelope solitary waves are examined. The superthermal parameters (ion-to-electron temperature ratio) give rise to instability (stability) of the solitary excitations, since the instability window is strongly modified. Finally, the present results should elucidate the excitation of the nonlinear ion-acoustic solitary wave packets in superthermal electron-positron-ion plasmas, particularly in interstellar medium.

Place, publisher, year, edition, pages
2011. Vol. 333, no 1, 203-208 p.
Keyword [en]
Electron positron ion plasmas, Superthermal electrons, Superthermal positrons, Fluid description, Modulational instability, Envelope solitons
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:umu:diva-104458DOI: 10.1007/s10509-010-0564-yISI: 000289000600024OAI: diva2:823778
Available from: 2015-06-18 Created: 2015-06-11 Last updated: 2015-06-18Bibliographically approved

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Shukla, Padma K.
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