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arXiv 2406.02083astro-ph.SR
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一个活动区在H$α$和Ca II 8662 Å谱线的同时光谱偏振观测

Simultaneous spectropolarimetric observations in the H$α$ and Ca II 8662 Å lines of an active region

Harsh Mathur, K. Nagaraju, Rahul Yadav, Jayant Joshi

AI总结:

本文通过同时观测活动区H$α$和Ca II 8662 Å谱线的光谱偏振数据,结合non-LTE反演与弱场近似,揭示了太阳黑子亮桥和发射区域中视线方向磁场随光深的分层变化特征。

摘要:

我们展示了在一个活动区中同时记录于H$α$和Ca II 8662 Å谱线的光谱偏振观测。该太阳黑子呈现出多种结构,包括一条亮桥和一个Ca II 8662 Å谱线核心处于发射状态的区域。相应地,H$α$谱线核心图像在该发射区域显示出增亮,光谱轮廓表现出抬升的谱线核心。通过Ca II 8662 Å谱线的非局部热动平衡(non-LTE)多谱线反演以及H$α$谱线上的弱场近似(WFA),推断了视线方向磁场的分层结构。从H$α$谱线核心推断出的场强始终小于在$\log τ_{500}$ = $-$4.5处通过反演得到的场强。然而,研究发现H$α$谱线核心上的弱场近似结果与在$\log τ_{500}$ = $-$4.5处通过反演得到的场强之间不存在相关性。在表现出发射特征的区域中,$\log τ_{500}$ = $-$4.5处的磁场形态与$\log τ_{500}$ = $-$1处的磁场形态相似,场强略高或相当。从H$α$谱线核心推断出的磁场形态也与发射区域中从H$α$谱线全光谱范围推断出的磁场形态相似。在亮桥处,$\log τ_{500}$ = $-$1处推断出的场强小于周围本影区域,而在$\log τ_{500}$ = $-$4.5处则相当。类似地,从H$α$谱线上的弱场近似推断出的亮桥处场强与周围本影区域相比也显得较低。

英文摘要:

We present spectropolarimetric observations of an active region recorded simultaneously in the H$α$ Ca II 8662 Å lines. The sunspot exhibits multiple structures, including a lightbridge and a region where Ca II 8662 Å line core is in emission. Correspondingly, the H$α$ line core image displays brightening in the emission region, with the spectral profiles showing elevated line cores. The stratification of the line-of-sight magnetic field is inferred through non-LTE multiline inversions of the Ca II 8662 Å line and the weak field approximation over the H$α$ line. The field strength inferred from the H$α$ line core is consistently smaller than that inferred from inversions at $\log τ_{500}$ = $-$4.5. However, the study finds no correlation between the WFA over the core of the H$α$ line and that inferred from inversions at $\log τ_{500}$ = $-$4.5. In regions exhibiting emission features, the morphology of the magnetic field at $\log τ_{500}$ = $-$4.5 resembles that at $\log τ_{500}$ = $-$1, with slightly higher or comparable field strengths. The magnetic field morphology inferred from the core of the H$α$ line is also similar to that inferred from the full spectral range of the H$α$ line in the emission region. The field strength inferred in the lightbridge at $\log τ_{500}$ = $-$1 is smaller than the surrounding umbral regions and comparable at $\log τ_{500}$ = $-$4.5. Similarly, the field strength inferred in the lightbridge from the WFA over the H$α$ line appears lower compared to the surrounding umbral regions.

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