Ion acoustic soliton in weakly relativistic magnetized electron-positron-ion plasma

A theoretical investigation was made for the ion acoustic wave in a weakly relativistic magnetized electron-positron-ion warm plasma. A Korteweg-de vries equation (KdV) is derived by using a standard reductive perturbation method. It is found that the presence of ion temperature (sigma), ratios of positron-to-electron density (beta), electron-to-positron temperature (alpha), and relativistic factor (U-r) significantly modify solitonic behavior. The authors observed that these parameters considerably change the amplitude and width of the solitary wave.