Damped dust-ion-acoustic solitons in collisional magnetized nonthermal plasmas

Abstract

A multi-species magnetized collisional nonthermal plasma system, containing inertial ion species, non-inertial electron species following nonthermal κ− distribution, and immobile dust particles, is considered to model the dissipative dust-ion-acoustic (DIA) soliton modes, both theoretically and numerically. The electrostatic solitary modes are found to be associated with the low frequency dissipative dust-ion-acoustic solitary waves (DIASWs).The ion-neutral collision is taken into account and the influence of ion-neutral collisional effects on the dynamics of dissipative DIASWs are investigated. It is reported that most of the plasma medium in space and laboratory are far from thermal equilibrium, and the particles in such plasma system are well fitted via the κ−nonthermal distribution than via the thermal Maxwellian distribution. The reductive perturbation approach is adopted to derive the damped KdV equation, and the solitary wave solution of damped KdV equation is derived via the tangent hyperbolic method to analyze the basic features (amplitude, width, speed, time evolution, etc.) of dissipative DIASWs. The propagation nature and also the basic features of dissipative DIASWs are seen to influence significantly due to the variation of the plasma configuration parameters and also due to the variation of the supethermality index κ in the considered plasma system. The implication of results of this study could be useful of better understanding the electrostatic localized disturbances, in the ion length and time scale, in space and experimental dusty plasmas, where the presence of excess energetic electrons and ion-neutral collisional damping are accountable.