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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Rarefactive ion-acoustic electrostatic solitary structures in nonthermal plasmas
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Rarefactive ion-acoustic electrostatic solitary structures in nonthermal plasmas

机译：非热等离子体中的Rarefactive离子声静电孤立结构

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摘要

An investigation has been made of ion-acoustic solitary waves in an unmagnetized nonthermal plasma whose constituents are an inertial ion fluid and nonthermally distributed electrons. The properties of stationary solitary structures are briefly studied by the pseudo-potential approach, which is valid for arbitrary amplitude waves, and by the reductive perturbation method which is valid for small but finite amplitude limit. The time evolution of both compressive and rarefactive solitary waves, which are found to coexist in this nonthermal plasma model, is also examined by solving numerically the full set of fluid equations. The temporal behaviour of positive (compressive) solitary waves is found to be typical, i.e., the positive initial disturbance breaks up into a series of solitary waves with the largest in front. However, the behaviour of negative (rarefactive) solitary waves is quite different. These waves appear to be unstable and produce positive solitary waves at a later time. The relevancy of this investigation to observations in the magnetosphere of density depressions is briefly pointed out.
机译：已对非磁化非热等离子体中的离子声孤立波进行了研究，其组成是惯性离子流体和非热分布电子。通过对任意振幅波均有效的伪势方法和对较小但有限的振幅极限有效的归纳摄动方法，简要研究了静态孤立结构的特性。在此非热等离子体模型中共存的压缩孤波和稀疏孤波的时间演化也通过数值求解整个流体方程组进行了研究。发现正（压缩）孤波的时间行为是典型的，即，正的初始扰动分解为一系列的孤波，其中前者最大。但是，负（无反射）孤立波的行为是完全不同的。这些波似乎不稳定，并在以后产生正孤立波。简要指出了这项研究与密度下降的磁层中观测的相关性。

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