多组分尘埃等离子体中非线性尘埃声孤波的传播特征  

Propagating characteristics of nonlinear dust acoustic solitary waves in multicomponent dusty plasma

作　　者：林麦麦[1] 王明月 蒋蕾 Lin Mai-Mai;Wang Ming-Yue;Jiang Lei(College of Physical and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070

出　　处：《物理学报》2023年第3期159-168,共10页Acta Physica Sinica

摘　　要：采用Sagdeev势方法研究了多组分尘埃等离子体中的非线性尘埃声孤波的传播特征.推导得到了在含有尘埃颗粒、电子流、质子流及Kappa电子和离子的多组分尘埃等离子体中的非线性尘埃声波所对应的Sagdeev势函数.并利用定性分析方法,确定该系统同时存在线性周期波解轨道、非线性周期波解轨道和孤立波解轨道.与此同时,借助数值模拟方法发现:该多组分尘埃等离子体系统中仅存在振幅小于零的稀疏型孤立波,且非线性尘埃声孤波的振幅、宽度及波形等传播特征均与马赫数M、多种粒子数密度、温度、电荷量、质量及Kappa电子数、离子数等各种系统参数存在紧密关联.Nowadays,the dusty plasma has become an interesting new branch of the plasma physics.As is well known,the dusty plasmas play a significant role in the space,astrophysical and laboratory environments.In these days,the studying of the nonlinear waves in dusty plasma has attracted researchers’attention,in order to explain many basic phenomena in the plasma physics.The nonlinear waves play an important role in studying dusty plasma environments,such as the aster-oid zones,the earth’s mesosphere,and the planetary rings.In this work,the propagating characteristics of nonlinear dust acoustic solitary waves in a multicomponent dusty plasma which is composed of positively charged dust particles,streaming protons and electrons,Kappa distributed electrons and ions are studied in detail.The Sagdeev potential method is employed to investigate the large amplitude dust acoustic waves.It has an evidence for the existence of compressive and rarefractive solitary waves.With the help of the Sagdeev potential method,the Sagdeev potential function and the bifurcation analysis of phase-portrait are obtained.Firstly,the Sagdeev potential function is obtained by the Sagdeev potential method.Then,the variations of phase diagram with different parameters in a twodimensional autonomous system in the multicomponent dusty plasma system are investigated.It is found that the system has the linear wave solutions,nonlinear wave solutions,and solitary wave solutions at the same time.Meanwhile,the existence of different wave behaviors is closely related to various system factors.Moreover,it is found that only the rarefractive solitary waves exist in the multicomponent dusty plasma system by using the numerical simulation technique.Finally,the important influence of system parameter on the phase diagram,the Sagdeev potential function and the propagating characteristics of nonlinear dust acoustic solitary waves are discussed clearly.The results show that the different system parameters such as Mach number M,the masses,the temperatures,the number

关 键 词：多组分尘埃等离子体 尘埃声孤波 Sagdeev势方法 

分 类 号：O53[理学—等离子体物理]