Effects of non-Maxwellian electron densities on
the low frequency electrostatic waves and instabilities are
pointed out in a bi-ion plasma having field-aligned shear
flow. Several different electron densities are used and forma-
tion of nonlinear stationary structures is investigated in dif-
ferent limits. Solutions of nonlinear equations are obtained
in the form of KdV solitons and vortices and results are
applied to terrestrial ionosphere. The deviation from Boltz-
mann density of the electrons enhances the linear shear flow-
driven ion acoustic instability in the bi-ion plasma. But it
plays destructive role in the formation of pulse type solitons.

EB00000003968K

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• Electrostatic instabilities and nonlinear structures associated with field-aligned plasma flows and Cairns-Tsallis electrons in the ionosphere