DKIST Unveils the Serpentine Topology of Quiet Sun Magnetism in the Photosphere

IF 8.8 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astrophysical Journal Letters Pub Date : 2023-10-01 DOI:10.3847/2041-8213/acf85d

Ryan J. Campbell, P. H. Keys, M. Mathioudakis, F. Wöger, T. Schad, A. Tritschler, A. G. de Wijn, H. N. Smitha, C. Beck, D. J. Christian, D. B. Jess, R. Erdélyi

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引用次数: 0

Abstract

Abstract We present the first quiet Sun spectropolarimetric observations obtained with the Visible SpectroPolarimeter at the 4 m Daniel K. Inouye Solar Telescope. We recorded observations in a wavelength range that includes the magnetically sensitive Fe i 6301.5/6302.5 Å doublet. With an estimated spatial resolution of 0.″08, this represents the highest spatial resolution full-vector spectropolarimetric observations ever obtained of the quiet Sun. We identified 53 small-scale magnetic elements, including 47 magnetic loops and four unipolar magnetic patches, with linear and circular polarization detected in all of them. Of particular interest is a magnetic element in which the polarity of the magnetic vector appears to change three times in only 400 km and which has linear polarization signals throughout. We find complex Stokes V profiles at the polarity inversion lines of magnetic loops and discover degenerate solutions, as we are unable to conclusively determine whether these arise due to gradients in the atmospheric parameters or smearing of opposite-polarity signals. We analyze a granule that notably has linear and circular polarization signals throughout, providing an opportunity to explore its magnetic properties. On this small scale, we see the magnetic field strength range from 25 G at the granular boundary to 2 kG in the intergranular lane (IGL) and sanity-check the values with the weak and strong field approximations. A value of 2 kG in the IGL is among the highest measurements ever recorded for the internetwork.

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DKIST揭示了光球中安静太阳磁性的蛇形拓扑结构

摘要:本文介绍了在4米Daniel K. Inouye太阳望远镜上使用可见分光偏振计获得的第一个安静太阳分光偏振观测结果。我们记录的观测波长范围包括磁敏感的Fe i 6301.5/6302.5 Å双峰。估计空间分辨率为0。″08，这代表了对安静的太阳所获得的最高空间分辨率的全矢量光谱偏振观测。我们发现了53个小尺度磁元素，包括47个磁环和4个单极磁片，它们都检测到线性和圆极化。特别令人感兴趣的是一种磁元件，其中磁矢量的极性在仅400公里内似乎改变了三次，并且在整个过程中具有线性极化信号。我们在磁环的极性反转线上发现了复杂的Stokes V剖面，并发现了简并解，因为我们无法最终确定这些是由于大气参数的梯度还是相反极性信号的涂抹而产生的。我们分析了一个明显具有线性和圆极化信号的颗粒，为探索其磁性提供了机会。在这个小尺度上，我们看到磁场强度范围从颗粒边界的25 G到颗粒间通道(IGL)的2 kG，并与弱场和强场近似进行了完整性检查。IGL中2 kG的值是互联网有史以来记录的最高测量值之一。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astrophysical Journal Letters ASTRONOMY & ASTROPHYSICS-

CiteScore

14.10

自引率

6.30%

发文量

513

审稿时长

2-3 weeks

期刊介绍： The Astrophysical Journal Letters (ApJL) is widely regarded as the foremost journal for swiftly disseminating groundbreaking astronomical research. It focuses on concise reports that highlight pivotal advancements in the field of astrophysics. By prioritizing timeliness and the generation of immediate interest among researchers, ApJL showcases articles featuring novel discoveries and critical findings that have a profound effect on the scientific community. Moreover, ApJL ensures that published articles are comprehensive in their scope, presenting context that can be readily comprehensible to scientists who may not possess expertise in the specific disciplines covered.