Nonlinear Reconnection in Magnetized Turbulence
Nonlinear Reconnection in Magnetized Turbulence
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DOI：
10.3847/1538-4357/ab6a95
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发表时间：
2019-07
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
最近对强磁化等离子体湍流的分析工作假设存在一系列尺度，其中撕裂不稳定性可能支配能量级联。在本文中，我们估计的条件下，这种撕裂可能会引起完全非线性磁场重联的湍流涡旋。当这些条件得到满足时，一个新的湍流状态被访问，其中重连驱动的能量耗散变得常见，而不是罕见的功能，它必须当它们不。我们的结论是，虽然这样的条件是非常严格的流体尺度的涡旋，它们很容易满足动力学尺度的涡旋，特别是，我们建议，我们的论点可能有助于解释最近的磁层多尺度（MMS）观测（所谓的）电子只有重联和能量耗散通过电子朗道阻尼在地球的磁鞘。
Recent analytical works on strong magnetized plasma turbulence have hypothesized the existence of a range of scales where the tearing instability may govern the energy cascade. In this paper, we estimate the conditions under which such tearing may give rise to full nonlinear magnetic reconnection in the turbulent eddies. When those conditions are met, a new turbulence regime is accessed where reconnection-driven energy dissipation becomes common, rather than the rare feature that it must be when they are not. We conclude that while such conditions are very stringent for fluid-scale eddies, they are easily met for kinetic-scale eddies; in particular, we suggest that our arguments may help explain recent Magnetospheric Multiscale (MMS) observations of (so-called) electron-only reconnection and of energy dissipation via electron Landau damping in the Earth's magnetosheath.