Effects of electron suprathermality and positron density on ion acoustic dressed solitons in an electron-positron-ion plasma

Summary form only given. Study of linear or nonlinear wave phenomena in electron-positron (e-p) plasmas attracted much attention during the last decade due to their frequent occurrence in active galactic nuclei, pulsar magnetosphere and in solar atmosphere. The electron-positron (e-p) plasmas are also believed to play an important role in understanding the early universe. The aim of this communication is to study a small-amplitude ion acoustic dressed solitons in a three components plasma consisting of cold ions, suprathermal electrons and positrons. We have then investigate the effect of electron suprathermality and positron density on small amplitude ion acoustic dressed wave and compared the result with the soliton's exact solution of the fourth order pseudo-potential and K-dV soliton. Our result reveal that the amplitude and the width of the core and cloud structures, K-dV soliton, dressed soliton and the small amplitude exact soliton solution are significantly modified by the suprathermality effects.