Abstract
Adiabatic multi-ions species containing positive and negative ions in the presence of nonthermal electrons are considered. The properties of small, but finite, ion acoustic waves are investigated taking into account the pressure effect of positive/negative ions in the fluid equations with a polytropic (γ) coefficient ranging from 1 to 3. The reductive perturbation method has been employed to derive the Korteweg-de Vries equation for small amplitude ion-acoustic waves. The effect of ion pressure is found important, particularly for higher values of γ. The results of the present investigation may be applicable to some plasma environments, such as the Earth’s ionosphere region.
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