M. Ferdousi

Ion-Acoustic Shock Waves in Nonextensive Electron-Positron-Ion Plasma

The properties of cylindrical and spherical ion-acoustic shock waves in an unmagnetized plasma system consisting of inertial ions, nonextensive electrons, and nonextensive positrons are investigated. A modified Burgers equation is derived using the reductive perturbation technique and its numerical solution is obtained. It is found that the properties of the cylindrical and spherical ion-acoustic shock waves significantly differ from those of 1-D planar shock waves. The findings of this investigation may be used in understanding the wave propagation in laboratory and space plasmas.

Cylindrical and Spherical Ion-Acoustic Shock Waves in Nonextensive Electron-Positron–Ion Plasma

The properties of cylindrical and spherical ion-acoustic shock waves in an unmagnetized plasma system consisting of inertial ions, nonextensive electrons, and nonextensive positrons are investigated. A modified Burgers equation is derived using the reductive perturbation technique and its numerical solution is obtained. It is found that the properties of the cylindrical and spherical ion-acoustic shock waves significantly differ from those of 1-D planar shock waves. The findings of this investigation may be used in understanding the wave propagation in laboratory and space plasmas.

Ion-acoustic Gardner solitons in a four-component nonextensive multi-ion plasma

The nonlinear propagation of ion-acoustic (IA) solitary waves (SWs) in a four-component non-extensive multi-ion plasma system containing inertial positively charged light ions, negatively charged heavy ions, as well as noninertial nonextensive electrons and positrons has been theoretically investigated. The reductive perturbation method has been employed to derive the nonlinear equations, namely, Korteweg−deVries (KdV), modified KdV (mKdV), and Gardner equations. The basic features (viz. polarity, amplitude, width, etc.) of Gardner solitons are found to exist beyond the KdV limit and these IA Gardner solitons are qualitatively different from the KdV and mKdV solitons. It is observed that the basic features of IA SWs are modified by various plasma parameters (viz. electron and positron nonextensivity, electron number density to ion number density, and electron temperature to positron temperature, etc.) of the considered plasma system. The results obtained from this theoretical investigation may be useful in understanding the basic features of IA SWs propagating in both space and laboratory plasmas.