Oblique propagation of electrostatic waves in a magnetized EPI plasma

TL;DR

This paper theoretically explores how oblique magnetic fields and superthermal particles influence the nonlinear propagation of heavy ion-acoustic waves in a magnetized electron-positron-ion plasma, relevant to astrophysical phenomena.

Contribution

It derives and analyzes K-dV and modified K-dV equations for HIA waves in a magnetized EPI plasma, highlighting effects of magnetic obliqueness and superthermal particles on solitary wave properties.

Findings

External magnetic field and superthermal particles significantly alter solitary wave characteristics.

Both positive and negative potential solitary waves are possible under certain conditions.

Results are applicable to astrophysical objects like pulsars and active galactic nuclei.

Abstract

A theoretical investigation is carried out to understand the basic features of nonlinear propagation of heavy ion-acoustic (HIA) waves subjected to an external magnetic field in an electron-positron-ion (EPI) plasma which consists of cold magnetized positively charged heavy ion fluids, and superthermal distributed electrons and positrons. In the nonlinear regime, the Korteweg-de Vries (K-dV) and modified K-dV(MK-dV) equations describing the propagation of HIA waves are derived. The latter admits a solitary wave solution with both positive and negative potentials (for K-dV equation) and only positive potential (for mK-dV equation) in the weak amplitude limit. It is observed that the effects of external magnetic field (obliqueness), superthermal electrons and positrons, different plasma species concentration, heavy ion dynamics and temperature ratio significantly modify the basic features of solitary waves (SWs). The application of the results in a magnetized EPI plasma, which occurs in many astrophysical objects (e.g., pulsars, cluster explosions, and active galactic nuclei) is briefly discussed.