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On the generation of envelope solitons in the presence of excess superthermal electrons and positrons

Sabry, R. and Moslem, W. M. and Shukla, P. K. (2011) On the generation of envelope solitons in the presence of excess superthermal electrons and positrons. Astrophysics and Space Science, 333 (1). pp. 203-208. ISSN 0004-640X

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Abstract

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.

Item type: Article
ID code: 40552
Keywords: energies, superthermal positrons, plasma, superthermal electrons, kappa-distributions, electron positron ion plasmas, ION, envelope solitons, voyager, modulational instability, propagation, fluid description, protons, generation, excess superthermal electrons, superthermal , positrons, electrons, Physics, Astronomy and Astrophysics, Space and Planetary Science
Subjects: Science > Physics
Department: Faculty of Science > Physics
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Depositing user: Pure Administrator
Date Deposited: 25 Jul 2012 14:17
Last modified: 27 Mar 2014 10:20
URI: http://strathprints.strath.ac.uk/id/eprint/40552

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