Quasi‐linear theory of anomalous resistivity
Quasi‐linear theory of anomalous resistivity
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DOI：
10.1029/2005ja011482
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发表时间：
2006-02
影响因子：
--
通讯作者：
P. Yoon;A. Lui
中科院分区：
文献类型：
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作者：
P. Yoon;A. Lui
[1]磁重联是理解空间和实验室等离子体中带电粒子加速现象的有利机制。在磁场重联中设想磁场线拓扑的变化以释放所存储的磁场能量。为了实现这一点，需要某种形式的耗散来打破冻结条件。由于经典的电阻率往往是不够的碰撞等离子体，异常电阻率通过带电粒子与波动的电磁场相互作用，习惯上调用。然而，异常电阻率通常是建模而不是从理论计算。本文从第一性原理出发，建立了反常输运理论。研究发现，涨落的影响可以通过控制动量和能量输运的三个反常输运项以及电阻率来定义。为了说明这些导出的方程的效用，承担相关的考虑在冻结条件下的磁重联击穿的例子进行了讨论。
[1] Magnetic reconnection is a favored mechanism for understanding charged-particle acceleration phenomena in space and laboratory plasmas. A change in magnetic field line topology is envisioned in magnetic reconnection to release the stored magnetic field energy. In order for this to take place, some form of dissipation to break the frozen-in condition is required. Since the classical resistivity is often inadequate for collisionless plasmas, anomalous resistivity via charged particles interacting with fluctuating electromagnetic fields is customarily invoked. However, anomalous resistivity is often modeled rather than computed from theory. In this article, we formulate the theory of anomalous transport from first principles. It is found that the effect of fluctuations can be defined through three anomalous transport terms governing momentum and energy transport and the resistivity. To illustrate the utility of these derived equations, examples that bear relevance to the consideration of breakdown in the frozen-in condition in magnetic reconnection are discussed.