Collisionless Reconnection in Magnetohydrodynamic and Kinetic Turbulence
Collisionless Reconnection in Magnetohydrodynamic and Kinetic Turbulence
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DOI：
10.3847/1538-4357/aa9754
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发表时间：
2017-07
期刊：
影响因子：
--
通讯作者：
N. Loureiro;S. Boldyrev
中科院分区：
文献类型：
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作者：
N. Loureiro;S. Boldyrev
最近有人提出，在磁流体动力学（MHD）湍流的惯性间隔终止在小尺度上的Kolmogorov样的耗散区，而是由一个新的亚惯性间隔介导的撕裂不稳定性。然而，许多天体物理等离子体几乎是无碰撞的，因此MHD近似不适用于小尺度的湍流。在本文中，我们提出了一个扩展的理论的重联介导的湍流等离子体是如此弱的碰撞，发生在湍流涡旋的重联是由电子惯性，而不是由电阻率。我们发现，重连介导的湍流的过渡尺度取决于等离子体β和等离子体湍流模型的假设。然而，在分析的所有情况下，在重新连接介导的时间间隔的能谱范围从到。
It has recently been proposed that the inertial interval in magnetohydrodynamic (MHD) turbulence is terminated at small scales not by a Kolmogorov-like dissipation region, but rather by a new sub-inertial interval mediated by tearing instability. However, many astrophysical plasmas are nearly collisionless so the MHD approximation is not applicable to turbulence at small scales. In this paper, we propose an extension of the theory of reconnection-mediated turbulence to plasmas which are so weakly collisional that the reconnection occurring in the turbulent eddies is caused by electron inertia rather than by resistivity. We find that the transition scale to reconnection-mediated turbulence depends on the plasma beta and on the assumptions of the plasma turbulence model. However, in all of the cases analyzed, the energy spectra in the reconnection-mediated interval range from to .