Oblique modulation of ion-acoustic waves and envelope solitons in electron-positron-ion plasma

被引：16
|
作者：
Jehan, Nusrat [1 ,2 ]
Salahuddin, M. [2 ]
Mirza, Arshad M. [1 ]
机构：
[1] Quaid I Azam Univ, Theoret Plasma Phys Grp, Dept Phys, Islamabad 45320, Pakistan
[2] Pakistan Atom Energy Commiss, Islamabad 44000, Pakistan
来源：
PHYSICS OF PLASMAS | 2009年 / 16卷 / 06期
关键词：
perturbation theory; plasma instability; plasma ion acoustic waves; plasma solitons; Schrodinger equation; PULSARS; TEMPERATURE; VORTICES;
D O I：
10.1063/1.3142473
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：
The effect of oblique modulation on the amplitude dynamics of ion-acoustic wave propagating in a collisionless electron-positron-ion plasma is investigated. Using Krylov-Bogoliubov-Mitropolsky (KBM) perturbation method, a nonlinear Schroumldinger (NLS) equation is derived which governs the evolution of obliquely modulated ion-acoustic envelope excitations. It is found that the presence of positron component significantly modifies the stability domains for small angles of propagation with the direction of modulation. The stationary solutions of NLS equation, i.e., bright and dark envelope solitons, become narrower as the concentration of positron component increases.
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页数：7
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