Comparative Study of Electric Currents and Energetic Particle Fluxes in a Solar Flare and Earth Magnetospheric Substorm
Comparative Study of Electric Currents and Energetic Particle Fluxes in a Solar Flare and Earth Magnetospheric Substorm
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DOI：
10.3847/1538-4357/ac2dfc
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发表时间：
2021-05
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通讯作者：
A. Artemyev;I. Zimovets;I. Sharykin;Y. Nishimura;C. Downs;J. Weygand;R. Fiori;Xiao‐jia Zhang;A. Runov;M. Velli;V. Angelopoulos;O. Panasenco;C. Russell;Y. Miyoshi;S. Kasahara;A. Matsuoka;S. Yokota;K. Keika;T. Hori;Y. Kazama;Shiang‐Yu Wang;I. Shinohara;Y. Ogawa
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作者：
A. Artemyev;I. Zimovets;I. Sharykin;Y. Nishimura;C. Downs;J. Weygand;R. Fiori;Xiao‐jia Zhang;A. Runov;M. Velli;V. Angelopoulos;O. Panasenco;C. Russell;Y. Miyoshi;S. Kasahara;A. Matsuoka;S. Yokota;K. Keika;T. Hori;Y. Kazama;Shiang‐Yu Wang;I. Shinohara;Y. Ogawa
磁力线重联是一个普遍的等离子体过程，负责将磁场能量转换为等离子体加热和带电粒子加速。太阳耀斑和地球磁层亚暴是两个研究最多的动力学系统，其中全球磁场重构伴随着等离子体种群的变化。这种重新配置包括形成一个长寿命电流系统，连接初级能量释放区和光球层/电离层的冷致密导电等离子体。在耀斑和亚暴中，这个电流系统的演化与高能粒子通量的形成和动力学相关（尽管这些系统的能量范围可能不同）。我们的研究集中在耀斑和亚暴之间的相似性。使用广泛的数据集可用于耀斑和亚暴的调查，我们定性地比较一个耀斑和一个亚暴的电流和高能粒子通量的动态。我们发现，有一个明确的相关性之间的高能粒子沉淀（与能量释放，由于从riometer和硬X射线测量看到的磁重联）和磁场重构/形成的电流系统，而长期的电流系统的演变相关性更好地与热等离子体通量（从原位和软X射线测量）。然后，我们讨论如何在现场测量磁层亚暴的数据集可以帮助解释太阳耀斑数据。
Magnetic field line reconnection is a universal plasma process responsible for the conversion of magnetic field energy to plasma heating and charged particle acceleration. Solar flares and Earth's magnetospheric substorms are two of the most investigated dynamical systems where global magnetic field reconfiguration is accompanied by energization of plasma populations. Such a reconfiguration includes formation of a long-living current system connecting the primary energy release region and cold dense conductive plasma of the photosphere/ionosphere. In both flares and substorms the evolution of this current system correlates with the formation and dynamics of energetic particle fluxes (although energy ranges can be different for these systems). Our study is focused on the similarity between flares and substorms. Using a wide range of data sets available for flare and substorm investigations, we qualitatively compare the dynamics of currents and energetic particle fluxes for one flare and one substorm. We show that there is a clear correlation between energetic particle precipitations (associated with energy release due to magnetic reconnection seen from riometer and hard X-ray measurements) and magnetic field reconfiguration/formation of the current system, whereas the long-term current system evolution correlates better with hot plasma fluxes (seen from in situ and soft X-ray measurements). We then discuss how data sets of in situ measurements of magnetospheric substorms can help interpret solar flare data.