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A theoretical investigation has been presented for the linear and nonlinear properties of obliquely propagating coupled low-frequency electrostatic drift and ion-acoustic (ED-IA) waves in a strongly magnetized nonuniform electron–positron–ion plasma in the presence of sheared ion flow. A result from our linear analysis is that the ED-IA waves can be unstable due to the ion sheared flow. In addition, it is shown that the nonlinear equations governing the dynamics of weakly interacting ED-IA waves admit vortex solutions of two different classes viz. a vortex chain and a double vortex.
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Shukla et al. (2003) studied this question.
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