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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Measurement of vector magnetic field in a flare kernel with a spectropolarimetric observation in He I 10830 angstrom
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Measurement of vector magnetic field in a flare kernel with a spectropolarimetric observation in He I 10830 angstrom

机译：闪光核中的矢量磁场测量，他在I 10830 Angstrom中的光谱晶体观察

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摘要

A flare kernel associated with a C4 class flare was observed in a spectral window including the He I triplet 10830 angstrom and Si I 10827 angstrom with a spectropolarimeter on the Domeless Solar Telescope at Hida Observatory on 2015 August 9. The observed Stokes profiles of the He I triplet in the flare kernel in its post-maximum phase are well reproduced through inversions considering the Zeeman and the Paschen-Back effects with a three-slab model of the flare kernel, in which two slabs which have upward and downward velocities produce emissions and one slab produces an absorption. The magnetic field strength inferred from the emission components of the He I line is 1400 G, which is significantly stronger than 690 G that is observed at the same location in the same line 6.5 hr before the flare. In addition, the photospheric magnetic field vector derived from the Si I10827 angstrom is similar to that of the flare kernel. To explain this result, we suggest that the emission in the He I triplet during the flare is produced in the deep layer, around which bombardment of non-thermal electrons leads to the formation of a coronal temperature plasma. Assuming a hydrogen column density at the location where the He I emissions are formed, and a power-law index of non-thermal electron energy distribution, we derived the low-energy cutoff of the non-thermal electron as 20-30 keV, which is consistent with that inferred from hard X-ray data obtained by RHESSI.
机译：在一个光谱窗口中观察到与C4类闪光相关联的耀斑内核，包括HIDA天文台的Triplet 10830 Angstrom和Si I 10827埃·Si I 10827埃·埃克拉省在2015年8月9日的HIDA天文台上的闪光极望远镜。观察到的斯托克斯概况在其最大阶段的闪光内核中的i三态通过考虑到塞曼和普拉布核的三板型模型的剽窃，其中两个板材产生了向上和向下速度的两平板一个板坯产生吸收。从HE I线的发射组分推断的磁场强度为1400g，该强度明显强于690g，在耀斑前6.5小时的同一位置观察到的690g。另外，从Si I10827埃埃斯克隆导出的光学磁场矢量类似于闪光核的磁场矢量。为了解释这一结果，我们建议在闪光期间的HE I三重子中的发射在深层中产生，周围的非热电子轰炸导致冠状温度等离子体的形成。假设形成了他排放的位置的氢柱密度，以及非热电子能量分布的动力法指标，我们源于20-30keV的非热电子的低能量截止值与rhesi获得的硬X射线数据推断一致。

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