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arXiv 1312.3443astro-ph.SR
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磁化等离子体放电中的热电流不稳定性

Thermo-Galvanometric Instabilities in Magnetized Plasma Disks

Alessio Franco, Giovanni Montani, Nakia Carlevaro

摘要:

在这项工作中,我们提出了一个完全电离的旋转等离子体盘的温度梯度和亚热背景磁场(朝向轴向方向)的线性稳定性分析。我们描述了如何等离子体的反应时,检流计和热磁现象,如霍尔和能斯特-艾丁斯豪森效应,被考虑在内,和子午线扰动的等离子体被认为是。它示出了如何,在理想的情况下,这导致一个显着的重叠的磁旋转不稳定性和热磁的。考虑到耗散效应,不稳定模式的整体阻尼,虽然不足以完全抑制不稳定性,出现特别是在热磁相关的分支的曲线。

英文摘要:

In this work, we present a linear stability analysis of fully-ionized rotating plasma disks with a temperature gradient and a sub-thermal background magnetic field (oriented towards the axial direction). We describe how the plasma reacts when galvanometric and thermo-magnetic phenomena, such as Hall and Nernst-Ettingshausen effects, are taken into account, and meridian perturbations of the plasma are considered. It is shown how, in the ideal case, this leads to a significant overlap of the Magneto-rotational Instability and the Thermo-magnetic one. Considering dissipative effects, an overall damping of the unstable modes, although not sufficient to fully suppress the instability, appears especially in the thermo-magnetic related branch of the curve.

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