Stop layer: a flow braking mechanism in space and support from a lab experiment

Stop layer: a flow braking mechanism in space and support from a lab experiment
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停止层:空间中的流动制动机制和实验室实验的支持

DOI:
10.1088/0741-3335/58/6/064001
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发表时间:
2016
影响因子:
2.2
通讯作者:
Haerendel G
Haerendel G
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Haerendel G

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本文简要介绍了两个完全独立的快速流动制动过程的发现,一个是通过实验室实验实现的(Lebedev et al 2014 Phys. Plasmas 21 056305),另一个是通过极光观测刺激的理论推理实现的(Haerendel 2015 a J. Geophys. 120 1697-714)。第一种被描述为当超音速等离子体流遇到壁面时形成的磁介导的子激波。第二个试图描述当来自中央磁尾的高β等离子体流遇到磁层的强近偶极场时会发生什么。术语停止层信号表明,流动动量和能量直接耦合到由宽度为c/ω pi的层内的霍尔电流产生的磁扰动场,并通过动力学阿尔文波立即传播到层外。由于实验室的情况并非完全没有碰撞,从离子到电子的能量转移和随后的辐射损失可能会有所贡献。对这两种情况的概述确定并讨论了这两种情况之间的六个共同点。指出停止层机制可以看作是重联过程的直接反转。
The paper presents short summaries and a synopsis of two completely independent discoveries of a fast flow braking process, one realized by a laboratory experiment (Lebedev et al 2014 Phys. Plasmas 21 056305), the other by theoretical reasoning stimulated by auroral observation (Haerendel 2015a J. Geophys. Res. Space Phys. 120 1697–714). The first has been described as a magnetically mediated sub-shock forming when a supersonic plasma flow meets a wall. The second tried to describe what happens when a high-beta plasma flow from the central magnetic tail meets the strong near-dipolar field of the magnetosphere. The term stop layer signals that flow momentum and energy are directly coupled to a magnetic perturbation field generated by a Hall current within a layer of the width of c/ω pi and immediately propagated out of the layer by kinetic Alfvén waves. As the laboratory situation is not completely collision-free, energy transfer from ions to electrons and subsequent radiative losses are likely to contribute. A synopsis of the two situations identifies and discusses six points of commonality between the two situations. It is pointed out that the stop layer mechanism can be regarded as a direct reversal of the reconnection process.
极地阿尔芬弧的作用和起源
DOI: --
发表时间: 2014
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