EFFECT OF DUST CHARGE FLUCTUATION ON DUST ACOUSTIC STRUCTURES IN MAGNETIZED DUSTY PLASMA CONTAINING NONEXTENSIVE ELECTRONS AND TWO TEMPERATURES ISOTHERMAL IONS

摘要

Effect of dust electrical charge fluctuations on the nature of dust acoustic solitary wave (DASW) in a four species magnetized dusty plasma contains nonextensive electrons and two temperature isothermal ions has been investigated. In this model the negative dust electric charge is considered to be proportional to plasma space potential. The nonlinear Zakharov-Kuznetsov (ZK) and modified Zakharov-Kuznetsov (mZK) equations are derived for DASW using standard reductive perturbation method (RPM). The combined effects of electron nonextensivity, and dust charge fluctuation on the DASW profile are analyzed. The different ranges of the nonextensive q-parameter are considered. Results show that solitary waves, that their amplitude and width of which depend sensitively on the q-nonextensive parameter can exist. Due to the electron nonextensivity and dust charge fluctuation rate, our dusty plasma model can admit positive potential as well as negative potential solitons. Results show that the amplitude of soliton increases with increasing the electron nonextensivity but its width decreases. Increasing the electrical charge fluctuation leads to decrease in both amplitude and width of DASW.