On the modulation of ionic velocity in electron-positron-ion plasmas

Ion-acoustic structures in electron positron ion (e-p-i) plasma are examined by algebraic analysis of model equations. The dynamic of solitary waves are studied through direct approach. The system energy is obtained in terms of velocity of ions. It is founded that, ion-acoustic solitary waves existence are sensitive to densities and temperatures ratio of electrons and positrons. A small but finite amplitude approximation for soliton and shock waves are studied. The effect of positron parameters on solitonic wave and shocks are also inspected. (C) 2017 The Authors. Production and hosting by Elsevier B.V. on behalf of Taibah University. This is an open access article under the CC BY-NC-ND license