Identification of Active Magnetic Reconnection Using Magnetic Flux Transport in Plasma Turbulence
Identification of Active Magnetic Reconnection Using Magnetic Flux Transport in Plasma Turbulence
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DOI：
10.3847/2041-8213/abea0b
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发表时间：
2021-03
期刊：
影响因子：
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通讯作者：
Tak Chu Li;Yi‐Hsin Liu;Y. Qi
中科院分区：
文献类型：
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作者：
Tak Chu Li;Yi‐Hsin Liu;Y. Qi
磁重联在等离子体湍流的动力学和能量学中起着重要的作用，在过去的二十年里，航天器的观测，模拟和理论，最近，磁鞘观测MMS。提出了一种基于磁通量输运（MFT）的湍流等离子体重联识别新方法。将该方法应用于二维等离子体湍流的回旋动力学模拟。三个活跃的重联X点的识别结果的报告。前两个X点已经发展出双向电子流出喷流。除了电子重联的范畴之外，第三个X点没有双向电子流出射流，因为流动被湍流修改。在所有的情况下，这种方法成功地确定了积极的重联通过明确的向内和向外的通量传输周围的X点。这种输运模式定义了重联，并在MFT的发散中产生了新的四极结构。该方法有望应用于MMS、帕克太阳探测器和太阳轨道器等航天器任务。
Magnetic reconnection has been suggested to play an important role in the dynamics and energetics of plasma turbulence by spacecraft observations, simulations, and theory over the past two decades, and recently, by magnetosheath observations of MMS. A new method based on magnetic flux transport (MFT) has been developed to identify reconnection activity in turbulent plasmas. This method is applied to a gyrokinetic simulation of two-dimensional (2D) plasma turbulence. Results on the identification of three active reconnection X-points are reported. The first two X-points have developed bidirectional electron outflow jets. Beyond the category of electron-only reconnection, the third X-point does not have bidirectional electron outflow jets because the flow is modified by turbulence. In all cases, this method successfully identifies active reconnection through clear inward and outward flux transport around the X-points. This transport pattern defines reconnection and produces a new quadrupolar structure in the divergence of MFT. This method is expected to be applicable to spacecraft missions such as MMS, Parker Solar Probe, and Solar Orbiter.