CYLINDRICAL AND SPHERICAL DUST-ION-ACOUSTIC MODIFIED GARDNER SOLITONS IN DUSTY PLASMAS WITH TWO-TEMPERATURE SUPERTHERMAL ELECTRONS

摘要

A rigorous theoretical investigation has been performed on the propagation of cylindrical and spherical Gardner solitons (GSs) associated with the dust-ion-acoustic (DIA) waves in a dusty plasma consisting of inertial ions, negatively charged immobile dust, and two population of kappa distributed electrons having two distinct temperatures. The well-known reductive perturbation method has been used to derive the modified Gardner (mG) equation. The basic features (amplitude, width, polarity, etc.) of nonplanar DIA modified Gardner solitons (mGSs) have been thoroughly examined by the numerical analysis of the mG equation. It has been found that the characteristics of the non-planar DIA mGSs significantly differ from those of planar ones. It has been also observed that kappa distributed electrons with two distinct temperatures significantly modify the basic properties of the DIA solitary waves, and that the plasma system under consideration supports both compressive and rarefactive DIA mGSs. The present investigation should play an important role for understanding the localized electrostatic disturbances in space and laboratory dusty plasmas where stationary negatively charged dust, inertial ions and superthermal electrons with two distinct temperatures are omnipresent ingredients.