Amplitude modulation of ion-acoustic waves in magnetized electron-positron-ionplasma with q-nonextensive electrons and positrons

Abstract

Using a standard reductive perturbation technique, a nonlinear Schrodinger equation has been derived thatdescribes the nonlinear evolution of ion-acoustic waves in magnetized electron-positron-ion plasma with electrons andpositrons following q-nonextensive distribution. It is shown that excitation of both bright and dark envelope solitarystructures is possible in the model plasma under consideration. The conditions for the excitation and structure of theseenvelope solitary waves are shown to depend sensitively on the strength of the external magnetic eld, obliqueness ofwave propagation relative to the external magnetic eld, and other plasma parameters such as the q-nonextensivity ofplasma species, positron concentration, and electron-positron temperature ratio.