Two-dimensional modulated ion-acoustic excitations in electronegative plasmas

Chérif S. Panguetna, Conrad B. Tabi, Timoléon C. Kofané

Research output: Contribution to journalArticle

8 Citations (Scopus)

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 (α) and the electron-to-negative ion temperature ratio (σ 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 α and σ n is discussed as well.
Original languageEnglish
JournalPhysics of Plasmas
Volume24
Issue number9
DOIs
Publication statusPublished - Sep 1 2017

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acoustic excitation
ion acoustic waves
ions
negative ions
temperature ratio
hydrodynamic equations
ion temperature
ion concentration
plane waves
solitary waves
activation
perturbation
expansion
sensitivity
electrons

Cite this

Panguetna, Chérif S. ; Tabi, Conrad B. ; Kofané, Timoléon C. / Two-dimensional modulated ion-acoustic excitations in electronegative plasmas. In: Physics of Plasmas. 2017 ; Vol. 24, No. 9.
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Two-dimensional modulated ion-acoustic excitations in electronegative plasmas. / Panguetna, Chérif S.; Tabi, Conrad B.; Kofané, Timoléon C.

In: Physics of Plasmas, Vol. 24, No. 9, 01.09.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Two-dimensional modulated ion-acoustic excitations in electronegative plasmas

AU - Panguetna, Chérif S.

AU - Tabi, Conrad B.

AU - Kofané, Timoléon C.

PY - 2017/9/1

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N2 - 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 (α) and the electron-to-negative ion temperature ratio (σ 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 α and σ n is discussed as well.

AB - 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 (α) and the electron-to-negative ion temperature ratio (σ 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 α and σ n is discussed as well.

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