Electronegative nonlinear oscillating modes in plasmas

Journal article

Authors / Editors

Tabi, Condrad

Research Areas

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Publication Details

Author list: Panguetna CS, Tabi CB, Kofane TC

Publisher: Elsevier

Place: AMSTERDAM

Publication year: 2018

Journal: Communications in Nonlinear Science and Numerical Simulation (1007-5704)

Journal acronym: COMMUN NONLINEAR SCI

Volume number: 55

Start page: 326

End page: 337

Number of pages: 12

ISSN: 1007-5704

eISSN: 1878-7274

Languages: English-Great Britain (EN-GB)

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Abstract

The emergence of nonlinear modulated waves is addressed in an unmagnetized electronegative plasma made of Boltzmann electrons, Boltzmann negative ions and cold mobile positive ions. The reductive perturbation method is used to reduce the dynamics of the whole system to a cubic nonlinear Schrdinger equation, whose the nonlinear and dispersion coefficients, P and Q, are function of the negative ion parameters, namely the negative ion concentration ratio (a) and the electron-to-negative ion temperature ratio (sn). It is observed that these parameters importantly affect the formation of modulated ion-acoustic waves, either as exact solutions or via the activation of modulational instability. Especially, the theory of modulational instability is used to show the correlation between the parametric analysis and the formation of modulated solitons, obtained here as bright envelopes and kink-wave solitons. (C) 2017 Elsevier B. V. All rights reserved.

Keywords

Electronegative plasma, Envelope solitons, Ion-acoustic waves, Modulational instability

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