arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.2182physics.plasm-phphysics.space-ph
收藏

Farley-Buneman不稳定性的简化非线性描述

Reduced nonlinear description of Farley-Buneman instability

A. S. Volokitin, B. Atamaniuk

摘要:

在电离层和磁层中的非线性波-波过程的研究中,当等离子体波具有较宽的频谱时,通常主要关注的是等离子体发展阶段的湍流。另一方面,众所周知,即使合作波的数量由于其不稳定性和衰减过程的竞争而保持较小,湍流也会出现在其随机行为的结果中。本文研究了在弱电离和非均匀电离层等离子体中,当存在垂直于环境磁场的电流时,Farley-Buneman不稳定性激发的低频波的非线性动力学。这个问题基本上是三维的,很难进行完整的数值模拟,但波的强碰撞阻尼允许假设,在这种情况下,扰动状态的等离子体可以被描述为有限的一组相互作用的波,其中一些是不稳定的和其他强阻尼。提出的非线性模型允许充分研究非线性稳定性,随机性条件,并考虑不同的制度和性质的少模等离子体湍流。

英文摘要:

In the study on nonlinear wave-wave processes in an ionosphere and a magnetosphere usually the main attention is paid to investigation of plasma turbulence at well developed stage, when the wide spectrum of plasma wave is present. On the other side, it is well known that even if the number of cooperating waves remains small due to a competition of processes of their instability and attenuation, the turbulence appears in the result of their stochastic behavior. The regimes of nonlinear dynamics of low frequency waves excited due to Farley-Buneman instability in weakly ionized and inhomogeneous ionospheric plasma in the presence of electric current perpendicular to ambient magnetic field are considered. The problem is essentially three dimensional and difficult for full numerical simulation, but the strong collisional damping of waves allow to assume that in this case a perturbed state of plasma can be described as finite set of interacting waves, some of which are unstable and other strongly damping. The proposed nonlinear model allow to make full study of nonlinear stabilization, conditions of stochasticity and to consider the different regimes and properties of few mode plasma turbulence.

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。

↑