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<p>The electron diffusion region (EDR) is the crucial region during magnetic reconnection. In this region, magnetic field lines break and reconnect, accompanied by explosive energy release. It is also the place where the energy is converted from the fields to the plasmas, thus generating energetic electrons. With the advancing of spacecraft detectors as well as the powerful computational resource devoted to numerical simulations, numerous progresses in uncovering new EDR features have been accomplished in recent decades. This review offers those new findings and attempts to establish a more sophisticated understanding of EDR, based on the in-situ spacecraft observations and kinetic simulations. Some of those new findings discussed in the context are not limited within the EDR, but in a wider spatial range in the reconnection region in general, since they could have direct or indirect impact on the EDR dynamics. Three major aspects of EDR are expanded to illustrate in detail: the complicated structures, the electron energization processes, and the wave activities. Eventually, we propose potential ways of studying the EDR in future research.</p>

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Recent advances on kinetic simulations and observations of electron diffusion region during magnetic reconnection in space plasmas

  • 期刊论文

  • 发表日期：

    2025年1月26日

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  • S. Y. Huang,
  • Q. Y. Xiong,
  • K. Jiang,
  • Z. G. Yuan,
  • R. T. Lin,
  • Y. T. Tang

摘要

The electron diffusion region (EDR) is the crucial region during magnetic reconnection. In this region, magnetic field lines break and reconnect, accompanied by explosive energy release. It is also the place where the energy is converted from the fields to the plasmas, thus generating energetic electrons. With the advancing of spacecraft detectors as well as the powerful computational resource devoted to numerical simulations, numerous progresses in uncovering new EDR features have been accomplished in recent decades. This review offers those new findings and attempts to establish a more sophisticated understanding of EDR, based on the in-situ spacecraft observations and kinetic simulations. Some of those new findings discussed in the context are not limited within the EDR, but in a wider spatial range in the reconnection region in general, since they could have direct or indirect impact on the EDR dynamics. Three major aspects of EDR are expanded to illustrate in detail: the complicated structures, the electron energization processes, and the wave activities. Eventually, we propose potential ways of studying the EDR in future research.