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Bandyopadhyay and Das [Phys. Plasmas, 9, 465-473, 2002] have derived anonlinear macroscopic evolution equation for ion acoustic wave in a magnetizedplasma consisting of warm adiabatic ions and non-thermal electrons includingthe effect of Landau damping. In that paper they have also derived thecorresponding nonlinear evolution equation when coefficient of the nonlinearterm of the above mentioned macroscopic evolution equation vanishes, thenonlinear behaviour of the ion acoustic wave is described by a modifiedmacroscopic evolution equation. But they have not considered the case when thecoefficient is very near to zero. This is the case we consider in this paperand we derive the corresponding evolution equation including the effect ofLandau damping. Finally, a solitary wave solution of this macroscopic evolutionis obtained, whose amplitude is found to decay slowly with time.

Effect of Landau damping on alternative ion-acoustic solitary waves in a  magnetized plasma consisting of warm adiabatic ions and non-thermal electrons