Propagation of ion-acoustic localized mode excitations and their modulational instability analysis in electron–positron–ion plasmas

The modulational instability of ion-acoustic waves (IAWs) in an unmagnetized multicomponent plasma is investigated, including a hot positrons, hot isothermal electrons and cold ions. Employing the reductive perturbation technique, the nonlinear Schr o ¨ dinger equation (NLSE) is derived. The effects...

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Bibliographic Details
Published in:Indian journal of physics 2021-10, Vol.95 (10), p.2217-2230
Main Author: Lavanya, C
Format: Article
Language:English
Subjects:
Acoustic propagation
Acoustic waves
Astrophysics and Astroparticles
Electrons
Original Paper
Perturbation methods
Physics
Physics and Astronomy
Plasmas (physics)
Positrons
Propagation modes
Stability
Stability analysis
Temperature ratio
Traveling waves
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Summary:The modulational instability of ion-acoustic waves (IAWs) in an unmagnetized multicomponent plasma is investigated, including a hot positrons, hot isothermal electrons and cold ions. Employing the reductive perturbation technique, the nonlinear Schr o ¨ dinger equation (NLSE) is derived. The effects of positron concentration and temperature ratio of electron to positron significantly modify the modulational instability and its growth rate. Results show that increasing the strength of these parameters leads to localization of IAWs. Further, the exact traveling wave solutions are studied using a modified extended tanh function method. The relevance of theoretical results may be beneficent in understanding the localized electrostatic disturbances in space and astrophysical situations where electron–positron–ion plasmas are present.
ISSN:0973-1458
0974-9845
DOI:10.1007/s12648-020-01876-3