Small amplitude dust acoustic solitary waves in a magnetized dusty plasma with nonthermal distribution for both electrons and ions

Abstract

The propagation of dust acoustic solitary waves (DASWs) has been investigated in a magnetized dusty plasma consisting of negatively charged dust particles, nonthermal ions and nonthermal electrons. Using reductive perturbation method, the korteweg-de-vries (K-dV) equation is derived. It is found that the basic structures (such as polarity, amplitude, width) of DASWs are influenced by nonthermal ions and nonthermal electrons. The results show that both compressive and rarefactive DASWs exist in such dusty plasma. It is observed that by increasing the nonthermality parameter of ions and electrons, the nonlinear wave phase velocity increases. Furthermore, nonthermal distributed ions have more effect on the nonlinear wave phase velocity of the DASWs than nonthermal distributed electrons. The dependence of the angle that the external magnetic field makes with the propagation direction of wave on the amplitude and width of DASWs has been also investigated. It was concluded that this angle strongly affects the DASWs. Finally, the effect of the magnetic field appears only in the width and not in the amplitude of the DASWs. The findings of this study can be helpful in understanding the structures of DASWs in the dusty plasma in which both nonthermal ions and nonthermal electrons exist. Such structures can be found in different regions of space and astrophysics mediums such as the upper ionosphere and Saturn’s E-ring.

Propagation characteristics of nonlinear dust acoustic solitary waves in complex plasma with nonthermal electrons and trapped ions

“…地球磁层、星际介质以及极光区等空间环境中的等 离子体所含电子存在nonthermal分布状态 [18][19][20][21][22][23] ; 太阳中微子中所含的电子则存在nonextensive分 布状态 [24] ; 而在地球磁层日侧极光带中的等离子 体所含电子则存在vortex-like分布 [25] . 另一方面, 在空间和实验室等离子体中的离子也会呈现多 种不同的分布形式, 例如在实验室的核聚变装置 中的等离子体所含离子存在陷俘(trapped)分布 状态 [23,26] . 土星e环中等离子体所含离子则存在 nonthermal分布 [27] ; 而金星电离层的等离子体则 存在superthermal离子分布形式 [28] .…”