Electron-acoustic solitary waves in the presence of a suprathermal electron component

Ashkbiz Danehkar, Naresh Saini, M.A. Hellberg, Ioannis Kourakis

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Abstract

The nonlinear dynamics of electron-acoustic localized structures in a collisionless and unmagnetized plasma consisting of “cool” inertial electrons, “hot” electrons having a kappa distribution, and stationary ions is studied. The inertialess hot electron distribution thus has a long-tailed suprathermal (non-Maxwellian) form. A dispersion relation is derived for linear electron-acoustic waves. They show a strong dependence of the charge screening mechanism on excess suprathermality (through ?). A nonlinear pseudopotential technique is employed to investigate the occurrence of stationary-profile solitary waves, focusing on how their characteristics depend on the spectral index ?, and the hot-to-cool electron temperature and density ratios. Only negative polarity solitary waves are found to exist, in a parameter region which becomes narrower as deviation from the Maxwellian (suprathermality) increases, while the soliton amplitude at fixed soliton speed increases. However, for a constant value of the true Mach number, the amplitude decreases for decreasing ?.
Original languageEnglish
Article number072902
Pages (from-to)072902/1-10
Number of pages10
JournalPhysics of Plasmas
Volume18
Issue number7
DOIs
Publication statusPublished - Jul 2011

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Danehkar, A., Saini, N., Hellberg, M. A., & Kourakis, I. (2011). Electron-acoustic solitary waves in the presence of a suprathermal electron component. Physics of Plasmas, 18(7), 072902/1-10. [072902]. https://doi.org/10.1063/1.3606365