双温非热尘埃等离子体中的尘埃声波  

Dust-Acoustic Waves in a Two-Temperature Nonthermal Dusty Plasma

作　　者：王红艳[1] 张开彪[1] 

机构地区：[1]四川理工学院理学院,四川自贡643000

出　　处：《四川师范大学学报（自然科学版）》2013年第6期911-914,共4页Journal of Sichuan Normal University（Natural Science）

基　　金：四川省教育厅青年基金(10ZB129和12ZB084)资助项目

摘　　要：考虑了弱高阶横向扰动的因素,对无磁化、无碰撞的由带负电的尘埃流体、满足非热分布的冷离子和热离子以及自由电子组成的尘埃等离子体为研究对象,使用约化摄动法得到了描述小振幅非线性尘埃声波的Coupled KP方程和孤波解.借助数学软件给出了数值模拟图,详细讨论了尘埃等离子体参数如快离子数、冷离子数密度以及冷离子与电子的温度对孤波结构的影响.从研究结果可以看出,这些参数均会影响和改变孤立波的振幅和宽度,而且会改变系统中出现的孤波类型.该研究对理解等离子体中的波动现象有重要意义.Considering the higher order transverse perturbations,an unmagnetized,eollisionless dusty plasma including negatively charged dust fluids,cold and hot ions which satisfied the nonthermal distributions and free electrons are studied in this paper.In order to study the small amplitude nonlinear dust-acoustic waves,a coupled Kadomtsev-Petviashvili （coupled KP） equation is derived by reduetive perturbation method.Using mathematical software,the numerical simulation diagam is given and the effects of dusty plasma parameters on the structures of solitary waves are analyzed carefully,such as the fast ions numbers,the cold ions number density and the ratio of the temperature of the cold ions and electrons.Our results show that these parameters play an important role on the solitons amplitude and width..Moreover,the types of solitary waves can be changed by them.This investigation has a potential importance in wave motions of plasma physics.

关 键 词：尘埃声孤波 COUPLED KP方程 双温非热离子 

分 类 号：O534[理学—等离子体物理]