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Temperature effects on ion acoustic solitons in plasmas with near critical density of negative ions

The authors establish a Korteweg-de Vries type equation to describe ion acoustic solitons in a plasma made up of electrons, positive and negative ions near the critical density. It is shown that the amplitudes and widths of compressive and rarefactive solitons are dependent on the ion temperatures and that this dependence is strongly asymmetric when the positive and negative ion temperatures are unequal. As an application, they analyse results of an experiment.