Microwave Spectral Imaging of an Erupting Magnetic Flux Rope: Implications for the Standard Solar Flare Model in Three Dimensions
Microwave Spectral Imaging of an Erupting Magnetic Flux Rope: Implications for the Standard Solar Flare Model in Three Dimensions
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DOI：
10.3847/2041-8213/ab901a
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
B. Chen 陈;Sijie 思捷 Yu 余;K. Reeves;D. Gary
中科院分区：
文献类型：
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作者：
B. Chen 陈;Sijie 思捷 Yu 余;K. Reeves;D. Gary
我们报告了2017年9月10日X8.2级肢体耀斑早期脉冲阶段爆发磁通绳的微波光谱成像观测，由扩展的欧文斯谷太阳能阵列获得。在爆发前几天，当相对于磁盘观察时，通量绳出现了一个反S形的暗丝，沿着磁极反转线。在爆发过程中，绳状体在极紫外和软X射线通带中表现出对1000 MK等离子体敏感的“热通道”结构。磁绳的中心部分几乎与视线对齐，在喷发的早期阶段，它迅速发展成一个泪滴状的黑暗空腔。一个长而薄的等离子体片形成的空腔下方，被解释为重联电流片的边缘。一个非热微波源存在于中心电流片的位置，向上延伸包围黑暗的空腔。一对非热微波源被观察了几分钟的两侧的主耀斑区。它们与空腔下方的中央微波源具有相似的时间行为和光谱特性，可以解释为爆发通量绳的共轭足点。这些观测结果与喷发太阳耀斑三维标准模型中提出的磁拓扑结构和相关能量释放情景大致一致。特别是，我们的非热发射共轭磁通绳足点的检测提供了坚实的证据，粒子运输沿着爆发磁通绳。
We report microwave spectral imaging observations of an erupting magnetic flux rope during the early impulsive phase of the X8.2-class limb flare on 2017 September 10, obtained by the Expanded Owens Valley Solar Array. A few days prior to the eruption, when viewed against the disk, the flux rope appeared as a reverse S-shaped dark filament along the magnetic polarity inversion line. During the eruption, the rope exhibited a “hot channel” structure in extreme ultraviolet and soft X-ray passbands sensitive to ∼10 MK plasma. The central portion of the flux rope was nearly aligned with the line of sight, which quickly developed into a teardrop-shaped dark cavity during the early phase of the eruption. A long and thin plasma sheet formed below the cavity, interpreted as the reconnection current sheet viewed edge on. A nonthermal microwave source was present at the location of the central current sheet, which extended upward encompassing the dark cavity. A pair of nonthermal microwave sources were observed for several minutes on both sides of the main flaring region. They shared a similar temporal behavior and spectral property to the central microwave source below the cavity, interpreted as the conjugate footpoints of the erupting flux rope. These observations are broadly consistent with the magnetic topology and the associated energy release scenario suggested in the three-dimensional standard model for eruptive solar flares. In particular, our detection of nonthermal emission at conjugate flux rope footpoints provides solid evidence of particle transport along an erupting magnetic flux rope.