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arXiv 2101.10885physics.plasm-ph
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复杂等离子体介质中的孤波和双层

Solitary waves and double layers in complex plasma media

A A Mamun, Abdul Mannan

摘要:

一个复杂的等离子体介质(包含凯恩斯非热电子物种,热惯性离子物种,和固定的正电荷尘埃(PCD)物种(使等离子体系统非常复杂)被认为是。利用赝势方法研究了PCD粒子、非热电子粒子和绝热离子温度对离子声孤波和双层波的影响,该方法适用于任意振幅的非时变孤波和双层波.据观察,PCD物种的存在降低了IA波的相速度,并因此支持IA亚音速压缩SW在这样的电子-离子-PCD等离子体。另一方面,绝热离子温度和非热或快电子数量的增加导致亚音速慢波形成的可能性降低,从而将亚音速慢波转换为超音速慢波。在非热参数达到一定值后,既有正负电势的IA超声SW,也有只有负电势的DL。介绍了这一工作在空间环境中的应用(即地球的中间层、彗星的尾巴、木星的磁层等)。和实验室设备,其中的温离子和非热电子物种以及PCD物种已被观察到,简要讨论。

英文摘要:

A complex plasma medium (containing Cairns nonthermal electron species, adiabatically warm inertial ion species, and stationary positively charged dust (PCD) species (making a plasma system very complex) is considered. The effects of PCD species, nonthermal electron species, and adiabatic ion-temperature on ion-acoustic (IA) solitary waves (SWs) and double layers (DLs) are investigated by the pseudo-potential approach, which is valid for the arbitrary amplitude time-independent SWs and DLs. It is observed that the presence of the PCD species reduces the phase speed of the IA waves, and consequently supports the IA subsonic compressive SWs in such electron-ion-PCD plasmas. On the other hand, the increase in both adiabatic ion-temperature and the number of nonthermal or fast electrons causes to reduce the possibility for the formation of the subsonic SWs, and thus convert subsonic SWs into supersonic ones. It is also observed that after at a certain value of the nonthermal parameter, the IA supersonic SWs with both positive and negative potentials as well as the DLs with only negative potential exist. The applications of the work in space environments (viz. Earth's mesosphere, cometary tails, Jupiter's magnetosphere, etc.) and laboratory devices, where the warm ion and nonthermal electron species along with PCD species have been observed, are briefly discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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