Large-amplitude dust acoustic solitons in an opposite polarity dusty plasma with generalized polarization force

Abstract

The linear and nonlinear dust acoustic (DA) waves have been investigated in an opposite polarity dusty plasma comprising negatively and positively charged dust grains, Maxwellian electrons and ions, including generalized polarization force efiect. The properties of linear DA waves have been signiflcantly altered by the dual dust polarity and the polarization force. Large amplitude DA solitons have been discussed in the framework of Sagdeev potential technique. Our results show that both the rarefactive and compressive solitons can exist in such a dusty plasma. The basic features of the Sagdeev potential have been examined under the efiect of the polarization force parameter R, the ratio of the charge number of the positive dust to that of the negative dust Z, and the Mach number M. The results show that these parameters play a signiflcant role in determining the region of the existence of large amplitude DA solitons.

Solitary waves and double layers of dust-acoustic waves propagating in a non-ideal dusty plasma

“…associated with the propagation of dust-acoustic waves (DAWs) has become one of the most important research topics in dusty plasma physics due to the important role not only in astrophysics space plasmas [1][2][3][4], but also in understanding the properties of laboratory plasmas [5,6]. Over the years, many investigations have been carried out on the nonlinear structures of DAWs in a dusty plasma physics, especially dust acoustic (DA) solitary waves, and double layers (DLs) [7][8][9][10][11][12][13][14][15][16][17][18]. Some of these investigations were limited to the framework of Sagdeev's approach (which is valid for large amplitude solitary waves) [11][12][13][14][16][17][18][19], while the other investigations are confined to the framework of modify Korteweg-de Vries (MKdV) equation [7,16,18], which is valid for small amplitude limit, but not valid for a parametric regime, in which the nonlinear term coefficient for Korteweg-de Vries (KdV) equation equal zero.…”