STUDY OF ION-ACOUSTIC RAREFACTIVE SOLITON IN A 2-ELECTRON TEMPERATUREPLASMA

The propagation characteristics of ion-acoustic rarefactive soliton (I ARS) in a two-electron temperature plasma with two cold ion species ar e investigated considering the nonisothermal distributions of electron s using a kinetic model and fluid model for both ion species, Using th e Sagdeev potential formalism the nonlinear dispersion relation and ex pression for width are derived for IARS. The variation of Mach number and width of the IARS with the amplitude is studied numerically and co mpared with earlier theoretical results as well as experimental observ ations. It is found that the results are improved qualitatively as wel l as quantitatively with the consideration of the presence of a suitab le negative ion-impurity.