• Ion-acoustic waves in magnetised plasma with nonthermal electrons and positrons

• Fulltext

https://www.ias.ac.in/article/fulltext/pram/094/0013

• Keywords

Zakharov–Kuznetsov equation; reductive perturbation method; solitary wave; nonthermal electron; positrons

• Abstract

Zakharov–Kuznetsov (ZK) equation for ion-acoustic waves (IAWs) is derived using the reductive perturbation method (RPM) in magnetised plasma consisting of ions, positrons and nonthermal electrons in small but finite amplitude limit. Propagation characteristics of ion-acoustic solitary waves (IASWs) in three-dimensional space are analysed to determine their region of existence. Investigations reveal that ion-acoustic solitary pulses (IASPs) may exist in such plasmas and presence of nonthermal electrons significantly affects the amplitude and width of solitary pulses. Dependence of velocity, amplitude and width of solitary pulses on plasma parameters arepresented graphically. The amplitude of soliton increases with increase in ion temperature ratio ($\sigma$) and positron concentration ($\alpha$). However, it decreases with increase in nonthermal electron parameter ($\beta$) keeping other plasma parameters constant. Width of the soliton increases with increase in $\beta$, $\sigma$ and $\alpha$. Phase velocity of ion-acoustic wave ($\lambda$) increases with increase in nonthermal $\beta$ and $\sigma$. In our analysis, we found that magnetisation of plasma affect the width of the soliton but not the amplitude.

• Author Affiliations

1. Government College, Thanagazi, Alwar 301 022, India
2. Government Girls College, Sirohi Palace Road, Sirohi 307 001, India
3. Poornima College of Engineering, Sitapura, Jaipur 302 022, India

• Pramana – Journal of Physics

Volume 95, 2021
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• Editorial Note on Continuous Article Publication

Posted on July 25, 2019