Oblique propagation of arbitrary amplitude electron acoustic solitary waves in magnetized kappa-distributed plasmas

TL;DR

This paper studies large amplitude electron-acoustic solitary waves in magnetized plasmas with superthermal electrons, analyzing their properties and existence conditions considering oblique propagation and plasma parameters.

Contribution

It introduces a comprehensive analysis of oblique electron-acoustic solitary waves in kappa-distributed plasmas, highlighting the effects of superthermality and magnetic field orientation.

Findings

Existence of large amplitude electrostatic solitary waves.

Influence of superthermality index on soliton properties.

Impact of obliqueness and magnetic field on wave characteristics.

Abstract

The linear and nonlinear properties of large amplitude electron-acoustic waves are investigated in a magnetized plasma comprising two distinct electron populations (hot and cold) and immobile ions. The hot electrons are assumed to be in a non-Maxwellian state, characterized by an excess of superthermal particles, here modelled by a kappa-type long-tailed distribution function. Waves are assumed to propagate obliquely to the ambient magnetic field. Two types of electrostatic modes are shown to exist in the linear regime, and their properties are briefly analyzed. A nonlinear pseudopotential type analysis reveals the existence of large amplitude electrostatic solitary waves and allows for an investigation of their propagation characteristics and existence domain, in terms of the soliton speed (Mach number). The effects of the key plasma configuration parameters, namely, the superthermality index and the cold electron density, on the soliton characteristics and existence domain, are studied. The role of obliqueness and magnetic field are discussed.