Energy Transport during 3D Small-scale Reconnection Driven by Anisotropic Plasma Turbulence
Energy Transport during 3D Small-scale Reconnection Driven by Anisotropic Plasma Turbulence
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DOI：
10.3847/1538-4357/ac8667
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发表时间：
2022-08
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影响因子：
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通讯作者：
Jeffersson A. Agudelo Rueda;D. Verscharen;R. Wicks;C. Owen;G. Nicolaou;K. Germaschewski;A. Walsh;I. Zouganelis;S. V. Domínguez
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作者：
Jeffersson A. Agudelo Rueda;D. Verscharen;R. Wicks;C. Owen;G. Nicolaou;K. Germaschewski;A. Walsh;I. Zouganelis;S. V. Domínguez
无碰撞等离子体中的能量耗散是一个长期存在的基本物理问题。虽然众所周知，磁重联和湍流耦合和传输能量从系统尺度到亚质子尺度，能量分布和能量耗散渠道的细节仍然知之甚少。特别是，与三维小尺度重联发生的湍流级联的结果是未知的能量转移和运输。我们使用一个显式的完全动力学的粒子在细胞的代码来模拟三维小尺度磁重联事件中形成的各向异性和衰减的Alfvénic湍流。我们确定了一个高度动态和不对称的重联事件，涉及两个重联通量绳。我们使用基于玻尔兹曼方程的双流体方法来研究与重联事件相关的空间能量传递，并将双流体能量方程中的功率密度项与标准的基于能量的阻尼、加热和耗散代理进行比较。我们的研究结果表明，电子体流传输热能密度比动能密度更有效。此外，在我们的湍流重联事件中，能量密度转移是由等离子体压缩。这与湍流流片和湍流重联事件一致，但与层流重联不一致。
Energy dissipation in collisionless plasmas is a long-standing fundamental physics problem. Although it is well known that magnetic reconnection and turbulence are coupled and transport energy from system-size scales to subproton scales, the details of the energy distribution and energy dissipation channels remain poorly understood. Especially, the energy transfer and transport associated with 3D small-scale reconnection that occurs as a consequence of a turbulent cascade is unknown. We use an explicit fully kinetic particle-in-cell code to simulate 3D small-scale magnetic reconnection events forming in anisotropic and decaying Alfvénic turbulence. We identify a highly dynamic and asymmetric reconnection event that involves two reconnecting flux ropes. We use a two-fluid approach based on the Boltzmann equation to study the spatial energy transfer associated with the reconnection event and compare the power density terms in the two-fluid energy equations with standard energy-based damping, heating, and dissipation proxies. Our findings suggest that the electron bulk flow transports thermal energy density more efficiently than kinetic energy density. Moreover, in our turbulent reconnection event, the energy density transfer is dominated by plasma compression. This is consistent with turbulent current sheets and turbulent reconnection events, but not with laminar reconnection.