Two-dimensional modulated ion-acoustic excitations in electronegative plasmas

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Author list: Panguetna CS, Tabi CB, Kofane TC

Publisher: American Institute of Physics

Place: MELVILLE

Publication year: 2017

Journal: Physics of Plasmas (1070-664X)

Journal acronym: PHYS PLASMAS

Volume number: 24

Issue number: 9

Number of pages: 11

ISSN: 1070-664X

eISSN: 1089-7674

Languages: English-Great Britain (EN-GB)

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Abstract

Two-dimensional modulated ion-acoustic waves are investigated in an electronegative plasma. Through the reductive perturbation expansion, the governing hydrodynamic equations are reduced to a Davey-Stewartson system with two-space variables. The latter is used to study the modulational instability of ion-acoustic waves along with the effect of plasma parameters, namely, the negative ion concentration ratio (alpha) and the electron-to-negative ion temperature ratio (sigma(n)). A parametric analysis of modulational instability is carried out, where regions of plasma parameters responsible for the emergence of modulated ion-acoustic waves are discussed, with emphasis on the behavior of the instability growth rate. Numerically, using perturbed plane waves as initial conditions, parameters from the instability regions give rise to series of dromion solitons under the activation of modulational instability. The sensitivity of the numerical solutions to plasma parameters is discussed. Some exact solutions in the form one-and two-dromion solutions are derived and their response to the effect of varying alpha and sigma(n) is discussed as well. Published by AIP Publishing.

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