The modulational instability of ion-acoustic waves (IAWs) in a four-component magneto-plasma system consisting positive–negative ions fluids and non-Maxwellian (r,q) distributed electrons positrons, is investigated. basic fluid equations reduced to three-dimensional (3D) nonlinear Schrödinger Equation (NLS). domains the IAWs stability are determined found be strongly affected by positrons spect...

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