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

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

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap%26ss.333..203s&link_type=abstract

Astrophysics and Space Science, Volume 333, Issue 1, pp.203-208

Astronomy and Astrophysics

Astrophysics

8

Electron Positron Ion Plasmas, Superthermal Electrons, Superthermal Positrons, Fluid Description, Modulational Instability, Envelope Solitons

Scientific paper

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 Schrödinger 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.

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