Ion-acoustic solitons and vortices in the e-p-i plasma with field-aligned inhomogeneous flow

摘要

The linear and nonlinear characteristics of the ion-acoustic waves are studied in a magnetized electron- positron-ion (e-p-i) plasma with shear flow along the ambient magnetic field. The sheared flow reduces or enhances the frequency of the wave strongly depending upon its polarity and nonlinear equations yield stable electrostatic structures in the form of solitons and vortices. Therefore, it is suggested that in the presence of shear flow, the electrostatic fields with real frequency omega(r) < c(s)k (where c(s) is the ion sound speed) exist in e-p-i plasmas. Numerical solutions are discussed using the normalized parameters. Published by AIP Publishing.