Ion acoustic and drift wave vortices in electron–positron–ion plasmas

Abstract

It is shown that two-dimensional large amplitude ion acoustic waves can give rise to dipolar vortex structures in magnetized homogeneous electron–positron–ion plasmas. In nonuniform plasmas they can couple with drift waves and similar structures can again be produced. A comparison with earlier works on pulse-like soliton formation of these waves in magnetized and unmagnetized electron–positron–ion plasmas is also presented.