Modulational Instability of Ion-Acoustic Waves and Associated Envelope Solitons in a Multi-Component Plasma

A generalized plasma model with inertial warm ions, inertialess iso-thermal electrons, super-thermal electrons and positrons is considered to theoretically investigate the modulational instability (MI) of ion-acoustic waves (IAWs). standard nonlinear Schrödinger equation derived by applying reductive perturbation method. It observed that stable domain IAWs decreases ion temperature but increases electron temperature. also found increasing (decreasing) (ion) number density. The present results will be useful in understanding conditions for MI which are relevant both space laboratory plasmas.