Interaction of electron acoustic waves in the presence of superthermal electrons in terrestrial magnetosphere

被引:27
|
作者
Jahangir, R. [1 ]
Masood, W. [2 ]
机构
[1] NCP, Quaid & Azam Univ Campus,Shandra Valley Rd 2141, Islamabad 44000, Pakistan
[2] COMSATS Univ Islamabad, Pk Rd, Islamabad 44000, Pakistan
关键词
SOLITARY WAVES; PLASMA; PROPAGATION; GENERATION; EQUATION; SOLITONS; DENSITY; FIELD;
D O I
10.1063/1.5143400
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We have investigated the propagation and interaction of nonlinear electron acoustic waves (EAWs) in a plasma comprising hot (superthermal) and cold electrons and immobile ions. We have derived the Korteweg-de Vries equation for EAWs in the small amplitude limit. Employing the Hirota's Direct method, we have investigated the multisoliton solutions for electron acoustic solitary waves (EASWs). It has been found that the system under consideration admits only rarefactive electrostatic solitary structures. As the observable data are available in terms of electric field rather than electric potential, therefore, we have discussed our results in terms of bipolar electric field structures. The numerical analysis has revealed that the ratio of hot to cold electrons and superthermality of hot electrons play a crucial role in changing the amplitude of EASWs. The interaction of the two solitons and its dependence on the choice of propagation vectors, superthermality, and density ratio have also been elaborated. The results of the present study may be beneficial to comprehend the interaction between two EASWs in astrophysical and laboratory plasmas.
引用
收藏
页数:7
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