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arXiv 2307.16635physics.plasm-ph
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非热温暖复杂等离子体中的大振幅尘声孤立波与双层结构

Large amplitude dust-acoustic solitary waves and double layers in nonthermal warm complex plasmas

N. Alam, A. Mannan, A. A. Mamun

AI总结:

本文采用Sagdeev伪势方法研究了含温暖带正电尘埃及非热分布电子和离子的等离子体中的大振幅尘声孤立波与双层结构,发现系统支持超音速正负孤立波及亚音速正孤立波与负双层,并阐明了等离子体参数对波形特性的显著影响及其在空间和实验室环境中的应用。

摘要:

采用Sagdeev伪势方法(其中非线性结构在随动参考系中是稳态的),研究了包含温暖带正电尘埃以及非热分布电子和离子的尘埃等离子体中的任意或大振幅尘声孤立波与双层结构。根据随等离子体参数变化的临界Mach数取值,发现了超音速和亚音速尘声孤立波。研究发现,所考虑的等离子体系统同时支持正极性和负极性的超音速孤立波,并且仅支持正极性亚音速孤立波和负极性双层结构。文中展示了亚音速和超音速尘声波存在的参数范围,以及孤立波极性如何随等离子体参数变化。观察到孤立波和双层结构解存在于Mach数接近其临界Mach数的取值处。孤立脉冲和双层结构的基本特性(振幅、宽度、速度等)受到等离子体参数(即离子与正尘埃数密度比、离子与电子温度比、非热参数、正尘埃温度与离子温度比等)的显著影响。此外,简要讨论了本工作在空间环境(如彗尾、地球中间层、木星磁层等)和实验室装置中的应用,这些环境中已观测到非热离子和电子物种以及带正电的尘埃物种。

英文摘要:

Using a Sagdeev pseudopotential approach where the nonlinear structures are stationary in a comoving frame, the arbitrary or large amplitude dust-acoustic solitary waves and double layers have been studied in dusty plasmas containing warm positively charged dust and nonthermal distributed electrons and ions. Depending on the values of the critical Mach number, which varies with the plasma parameter, both supersonic and subsonic dust-acoustic solitary waves are found. It is found that our plasma system under consideration supports both positive and negative supersonic solitary waves, and only positive subsonic solitary waves and negative double layers. The parametric regimes for the existence of subsonic and supersonic dust-acoustic waves and how the polarity of solitary waves changes with plasma parameters are shown. It is observed that the solitary waves and double layers solution exist at the values of Mach number around its critical Mach number. The basic properties (amplitude, width, speed, etc.) of the solitary pulses and double layers are significantly modified by the plasma parameters (viz. ion to positive dust number density ratio, ion to electron temperature ratio, nonthermal parameter, positive dust temperature to ion temperature ratio, etc.). The applications of our present work in space environments (viz. cometary tails, Earth's mesosphere, Jupiter's magnetosphere, etc.) and laboratory devices, where nonthermal ions and electrons species along with positively charged dust 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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