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Arbitrary amplitude ion acoustic solitons, double layers and supersolitons in a collisionless magnetized plasma consisting of non-thermal and isothermal electrons

  • Sandip Dalui ORCID logo EMAIL logo , Sankirtan Sardar ORCID logo and Anup Bandyopadhyay
Published/Copyright: March 8, 2021

Abstract

Using Sagdeev pseudo-potential technique, we have studied the arbitrary amplitude ion acoustic solitons, double layers and supersolitons in a collisionless plasma consisting of adiabatic warm ions, non-thermal hot electrons and isothermal cold electrons immersed in an external uniform static magnetic field. We have used the phase portraits of the dynamical system describing the non-linear behaviour of ion acoustic waves to confirm the existence of different solitary structures. We have found that the system supports (a) positive potential solitons, (b) negative potential solitons, (c) coexistence of both positive and negative potential solitons, (d) negative potential double layers, (e) negative potential supersolitons and (f) positive potential supersolitons. Again, we have seen that the amplitude of the positive potential solitons decreases or increases with increasing nch according to whether 0<nch<nch(c) or nch(c)<nch1, where nch is the ratio of isothermal cold and non-thermal hot electron number densities, and nch(c) is a critical value of nch. Also, we have seen that the amplitude of the positive potential solitons decreases with increasing βe, where βe is the non-thermal parameter. We have also investigated the transition of different negative potential solitary structures: negative potential soliton (before the formation of negative potential double layer) → negative potential double layer → negative potential supersoliton → negative potential soliton (after the formation of negative potential double layer) by considering the variation of θ only, where θ is angle between the direction of the external uniform static magnetic field and the direction of propagation of the ion acoustic wave.


Corresponding author: Sandip Dalui, Department of Mathematics, Jadavpur University, Kolkata700032, India, E-mail:

Acknowledgements

The authors are grateful to both the reviewers for their constructive comments, without which this paper could not have been written in its present form. The authors are also grateful to Prof. Manoranjan Khan, Emeritus Professor, Department of Instrumentation Science & Centre for Plasma studies, Jadavpur University for his helpful suggestions.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-10-17
Accepted: 2021-02-16
Published Online: 2021-03-08
Published in Print: 2021-05-26

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