Positron-acoustic Gardner solitons and double layers in electron-positron-ion plasmas with nonthermal electrons and positrons
Positron-acoustic Gardner solitons and double layers in electron-positron-ion plasmas with nonthermal electrons and positrons
复制标题
具有非热电子和正电子的电子-正电子离子等离子体中的正电子声加德纳孤子和双层
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Mamun
中科院分区：
文献类型：
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作者：
M. Rahman;M. Alam;A. Mamun
对由非移动的正离子、移动的冷正电子、非热热正电子和非热热热电子组成的四分量等离子体系统中的正电子声学Gardner孤子和双电层进行了理论研究。用约化摄动法导出了K-dV、修正K-dV和Gardner方程。基本特征（即振幅、极性、速度等）的PA GS以及PA DL的检查。并对K-dV孤子、mK-dV孤子和广义同步孤子进行了分析比较。研究表明，由于非热分布的热电子和热正电子的存在，这种PA孤子和DL的振幅、极性、速度、厚度都发生了显著的变化。我们的研究结果应该是有用的，了解各种星际空间等离子体环境（即电离层，磁层下部，极光加速区，超新星，脉冲星环境，集群爆炸，活动星系核等）。
A theoretical investigation has been made on positron-acoustic (PA) Gardner solitons (GSs) and double layers (DLs) in four-component plasma system consisting of immobile positive ions, mobile cold positrons, nonthermal hot positrons, and nonthermal hot electrons. The reductive perturbation method has been used to derive Korteweg-de Vries (K-dV), modified K-dV (mK-dV), and Gardner equations. The basic features (viz. amplitude, polarity, speed, etc.) of the PA GSs as well as PA DLs are examined. The analytical comparison among K-dV solitons, mK-dV solitons, and GSs are also made. It has been identified that the amplitude, polarity, speed, thickness of such PA solitons and DLs are significantly modified due to the presence of nonthermal distributed hot electrons and hot positrons. The results of our investigation should be useful for understanding various interstellar space plasma environments (viz. ionosphere, lower part of magnetosphere, auroral acceleration regions, supernovas, pulsar environments, cluster explosions, active galactic nuclei, etc.).