Magnetic Flux Transport Identification of Active Reconnection: MMS Observations in Earth’s Magnetosphere
Magnetic Flux Transport Identification of Active Reconnection: MMS Observations in Earth’s Magnetosphere
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DOI：
10.3847/2041-8213/ac5181
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Y. Qi;Tak Chu Li;C. Russell;R. Ergun;Yingdong Jia;M. Hubbert
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作者：
Y. Qi;Tak Chu Li;C. Russell;R. Ergun;Yingdong Jia;M. Hubbert
磁场重联在改变磁场拓扑结构的同时，对能量转换起着重要的作用。这个过程发生在不同的等离子体条件下，在此期间，磁通量的传输是内在的。通过原位观测确定活跃的磁场重联点是一项挑战。一种新的技术，磁通量输运（MFT）分析，最近已经发展起来，并在数值模拟中被证明是有效和准确地识别主动重联。在这项研究中，我们研究的MFT过程中，在37个以前报道的电子扩散区（EDR）/重联线交叉事件在白天侧磁层顶和磁尾和湍流磁鞘使用磁层多尺度测量。在X点处共存的向内和向外的MFT流提供了磁场线断开和重新连接的特征。现场观测的MFT分析的应用表明，MFT可以成功地识别活跃的重联网站在复杂的变化条件下，包括不对称和湍流上游条件。它还提供了比单独的血浆流出射流更高的识别率。MFT可用于单航天器和多航天器飞行任务以及实验室实验的现场测量。
Magnetic reconnection plays an important role in converting energy while modifying field topology. This process takes place under varied plasma conditions during which the transport of magnetic flux is intrinsic. Identifying active magnetic reconnection sites with in situ observations is challenging. A new technique, Magnetic Flux Transport (MFT) analysis, has been developed recently and proven in numerical simulation for identifying active reconnection efficiently and accurately. In this study, we examine the MFT process in 37 previously reported electron diffusion region (EDR)/reconnection-line crossing events at the day-side magnetopause and in the magnetotail and turbulent magnetosheath using Magnetospheric Multiscale measurements. The coexisting inward and outward MFT flows at an X-point provides a signature that magnetic field lines become disconnected and reconnected. The application of MFT analysis to in-situ observations demonstrates that MFT can successfully identify active reconnection sites under complex varied conditions, including asymmetric and turbulent upstream conditions. It also provides a higher rate of identification than plasma outflow jets alone. MFT can be applied to in situ measurements from both single- and multi-spacecraft missions and laboratory experiments.