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arXiv 2106.05084astro-ph.SR
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分光偏振观测对理解太阳现象的诊断能力I。塞曼敏感光球线

Diagnostic capabilities of spectropolarimetric observations for understanding solar phenomena I. Zeeman-sensitive photospheric lines

C. Quintero Noda, P. S. Barklem, R. Gafeira, B. Ruiz Cobo, M. Collados, M. Carlsson, V. Martínez Pillet, D. Orozco Suárez, H. Uitenbroek, Y. Katsukawa

摘要:

未来的地面望远镜将扩大我们在从近紫外到近红外的广泛波长范围内同时进行多线偏振观测的能力。这就产生了对比较候选谱线以建立最适合于每个观测目标的谱线的指南的强烈需求。我们的第一项工作集中在可见光和红外线的塞曼敏感光球线上。我们首先研究了他们的偏振信号和响应函数使用一维半经验的气氛。然后,我们研究了空间分布的线芯强度和线性和圆偏振信号,使用现实的三维数值模拟。我们对合成剖面进行了反演,并比较了输入和推断的大气之间高度相关的高度。我们还利用这个机会重新审视了我们在这些谱线上的原子信息,并计算了所有研究的谱线由于与中性氢原子碰撞而产生的增宽截面。结果表明,四条谱线在安静太阳和网络条件下脱颖而出:Fe I 5250.2,6302,8468和15648 A。前三条谱线在大气层较高处形成,最后一条谱线主要对光球层底部的大气参数敏感。然而,由于它们达到不同的高度,我们强烈建议使用前三个候选者中的至少一个与Fe I 15648 A线一起使用,以优化我们推断低层大气的热和磁性的能力。

英文摘要:

Future ground-based telescopes will expand our capabilities for simultaneous multi-line polarimetric observations in a wide range of wavelengths, from the near-ultraviolet to the near-infrared. This creates a strong demand to compare candidate spectral lines to establish a guideline of the lines that are most appropriate for each observation target. We focused in this first work on Zeeman-sensitive photospheric lines in the visible and infrared. We first examined their polarisation signals and response functions using a 1D semi-empirical atmosphere. Then we studied the spatial distribution of the line core intensity and linear and circular polarisation signals using a realistic 3D numerical simulation. We ran inversions of synthetic profiles, and we compared the heights at which we obtain a high correlation between the input and the inferred atmosphere. We also used this opportunity to revisit the atomic information we have on these lines and computed the broadening cross-sections due to collisions with neutral hydrogen atoms for all the studied spectral lines. The results reveal that four spectral lines stand out from the rest for quiet-Sun and network conditions: Fe I 5250.2, 6302, 8468, and 15648 A. The first three form higher in the atmosphere, and the last line is mainly sensitive to the atmospheric parameters at the bottom of the photosphere. However, as they reach different heights, we strongly recommend using at least one of the first three candidates together with the Fe I 15648 A line to optimise our capabilities for inferring the thermal and magnetic properties of the lower atmosphere.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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