Magnetoacoustic solitary waves in pair ion–electron plasmas

The nonlinear properties of magnetoacoustic solitary waves (MASWs) are investigated in magnetized pair ion–electron (PIE) plasmas. The three-fluid collisionless electromagnetic model is considered and the reductive perturbation method is employed to derive the Korteweg–de Vries equation for MASWs in PIE plasmas. It is found that the system under consideration admits compressive solitary structures. The effects of magnetic field intensity, plasma number density and negative ions concentration on MASWs are studied. This study may have relevance to nonlinear wave formation and the propagation of pair ion plasmas containing impurities. (paper)