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Propagation of ion-acoustic solitary waves (IASWs) is studied using thehydrodynamic equations coupled with the Poisson equation in a warm plasmaconsisting of adiabatic ions and superthermal (Kappa distributed) electrons inpresence of an electron-beam component. In the linear limit, the dispersionrelation for ion-acoustic (IA) waves is obtained by linearizing of basicequations. On the other hand, in the nonlinear analysis, an energy-balance likeequation involving Sagdeev's pseudo-potential is derived in order toinvestigate arbitrary amplitude IA solitons. The Mach number range isdetermined in which, propagation and characteristics of IA solitons areanalyzed both parametrically and numerically. The variation of amplitude andwidth of electrostatic (ES) excitations as a result of superthermality (via)and also the physical parameters (ion temperature, soliton speed, electron-beamdensity and electron-beam velocity) are examined. A typical interaction betweenIASWs and the electron-beam in plasma is confirmed. It is also found that ESsolitons with both negative polarity (rarefactive solitons) and positivepolarity (compressive solitons) can coexist in plasma. Furthermore, the smallbut finite amplitude limit of IASWs is investigated and it is showed that thislimit is restricted to negative potential pulses.

Interaction of ion-acoustic solitons with electron beam in warm plasmas with superthermal electrons