Papers by Chérif Panguetna
Physica Scripta, 2020
The dynamics of coupled ion-acoustic waves is investigated in an electronegative plasma made of B... more The dynamics of coupled ion-acoustic waves is investigated in an electronegative plasma made of Boltzmann negative ions, cold mobile positive ions and Boltzmann electrons. Using the reductive perturbation method, it is shown that the system can fully be described by a set of two coupled nonlinear Schrodinger equations. The parametric analysis of modulational instability reveals the existence of regions of instability that are sensitive to changes in plasma parameters such as the negative ion concentration ratio and the electron-to-negative ion temperature ratio. The analytical results are confronted to numerical simulations, where we examine the long-time dynamics of modulated waves in the electronegative plasma. One obtains the generation of nonlinear modulated waves that are sensitive to the negative-ion concentration ratio. Exact solutions for individual modes are discussed and one finally derives the coupled solution. The response of the latter to the plasma parameter variations is also addressed.
Journal of Theoretical and Applied Physics, 2019
Relativistic ion-acoustic waves are investigated in an electronegative plasma. The use of the red... more Relativistic ion-acoustic waves are investigated in an electronegative plasma. The use of the reductive perturbation method summarizes the hydrodynamic model to a nonlinear Schrödinger equation which supports the occurrence of modulational instability (MI). From the MI criterion, we derive a critical value for the relativistic parameter 1 , below which MI may develop in the system. The MI analysis is then conducted considering the presence and absence of negative ions, coupled to effects of relativistic parameter and the electron-to-negative ion temperature ratio. Under high values of the latter, additional regions of instability are detected, and their spatial expansion is very sensitive to the change in 1 and may support the appearance of rogue waves whose behaviors are discussed. The parametric analysis of super-rogue wave amplitude is performed, where its enhancement is debated relatively to changes in 1 , in the presence and absence of negative ions.
Physica B: Condensed Matter, 2018
Highlights • Modulated envelope waves are studied in three-dimensional electronegative plasmas. •... more Highlights • Modulated envelope waves are studied in three-dimensional electronegative plasmas. • The modulation angle and the plasma parameters are found to affect the stability of the plane wave solutions. • Oblique, parallel and transverse modulations are discussed. • Parallel and transverse modulations are detected in opposite plasma parameter regions.
Communications in Nonlinear Science and Numerical Simulation, 2018
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights • Modulated envelope solitons are investigated in electronegative plasmas. • Two regions of parameters with two different dynamical features are detected. • A new kink-wave soliton is found and efficiently responds to the negative ion parameters. • Modulational instability is highly affected by the negative ion parameters too.
Physics of Plasmas, 2017
Two-dimensional modulated ion-acoustic waves are investigated in an electronegative plasma. Throu... more 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 (a) and the electron-to-negative ion temperature ratio (r 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 a and r n is discussed as well. Published by AIP Publishing.
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Papers by Chérif Panguetna