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

R. Sabry, W. M. Moslem, P. K. Shukla

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35 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)203-208
Number of pages6
JournalAstrophysics and Space Science
Issue number1
Early online date16 Dec 2010
Publication statusPublished - May 2011


  • 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


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