Ion-Acoustic Solitary Structures in a Magnetized Plasma With Opposite Polarity Ions and κ–Distributed Trapped Electrons

Abstract

A magnetized plasma (comprising of inertial positive as well as negative ions, and noninertial superthermal electrons following the Schamel-Vasyliunas distribution function) is considered to investigate the nonlinear characteristics of obliquely propagating ion-acoustic (IA) solitary waves. The wave dissipation is taken into account via the ion-neutral collisions. Damped Schamel equation is derived by using the well-known reductive perturbation technique, and the solitary solution is used to study the characteristics of dissipative IA solitary waves in the proposed plasma. Only positive polarity solitary waves are shown to exist in the considered plasma system. This study explores how mass and magnitude of charge differences between the ions influence the propagation properties of solitary waves in asymmetric pair ion plasmas. The role of various plasma parameters such as electron density ratio, positive-to-negative ion temperature, trapping parameter, superthermality index, collisional term, magnetic field strength, obliqueness, and electric field are studied on the oblique propagation of IA solitary waves. These findings enhance our understanding of nonlinear phenomena in astrophysical environments and laboratory plasmas, where positive and negative ions and $\kappa $ nonthermal trapped electrons are available.