标题： 强温度各向异性对无碰撞慢激波和重联排气的动能结构的影响。 第二部分：理论 显示英文标题

标题： The effects of strong temperature anisotropy on the kinetic structure of collisionless slow shocks and reconnection exhausts. Part II: Theory

摘要： 无碰撞斜向传播的慢激波模拟揭示了与临界温度各向异性epsilon=1-mu_0(P_parallel-P_perpendicular)/ B^2 = 0.25 (Liu, Drake and Swisdak (2011))相关的过渡现象。 这里基于各向异性流体理论，特别是各向异性导数非线性薛定谔-伯格斯方程，提出了对此现象的解释，并给出了对下游反向流动离子的能量闭合的直观模型。 0.25的各向异性值具有重要意义，因为它与慢模和中间模的简并点密切相关，并对应于复合慢激波(SS)/旋转不连续性(RD)波内部共面到非共面过渡的下限。 这项工作表明，在磁重联中，流出物是由一对复合SS/RD波所限制的，而不是Petschek模型中的开关慢激波对。 这一事实可能解释了在实地观测中与Petschek重联相关的开关慢激波很少被观测到的原因。 显示英文摘要

摘要： Simulations of collisionless oblique propagating slow shocks have revealed the existence of a transition associated with a critical temperature anisotropy epsilon=1-mu_0(P_parallel-P_perpendicular)/ B^2 = 0.25 (Liu, Drake and Swisdak (2011)). An explanation for this phenomenon is proposed here based on anisotropic fluid theory, in particular the Anisotropic Derivative Nonlinear-Schrodinger-Burgers equation, with an intuitive model of the energy closure for the downstream counter-streaming ions. The anisotropy value of 0.25 is significant because it is closely related to the degeneracy point of the slow and intermediate modes, and corresponds to the lower bound of the coplanar to non-coplanar transition that occurs inside a compound slow shock (SS)/rotational discontinuity (RD) wave. This work implies that it is a pair of compound SS/RD waves that bound the outflows in magnetic reconnection, instead of a pair of switch-off slow shocks as in Petschek's model. This fact might explain the rareness of in-situ observations of Petschek-reconnection-associated switch-off slow shocks.