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 0004-640XFull text not available in this repository. (Request a copy from the Strathclyde author)
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.
|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|
|Depositing user:||Pure Administrator|
|Date Deposited:||25 Jul 2012 13:17|
|Last modified:||22 Mar 2017 12:14|