The instrumental advances made in this new era of 4 m class solar telescopes with unmatched spectropolarimetric accuracy and sensitivity will enable the study of chromospheric magnetic fields and their dynamics with unprecedented detail. In this regard, spectropolarimetric diagnostics can provide invaluable insight into magneto-hydrodynamic (MHD) wave processes. MHD waves and, in particular, Alfvénic fluctuations associated with particular wave modes were recently recognized as important mechanisms not only for the heating of the outer layers of the Sun’s atmosphere and the acceleration of the solar wind, but also for the elemental abundance anomaly observed in the corona of the Sun and other Sun-like stars (also known as first ionization potential) effect. Here, we take advantage of state-of-the-art and unique spectropolarimetric Interferometric BIdimensional Spectrometer observations to investigate the relation between intensity and circular polarization (CP) fluctuations in a sunspot chromosphere. Our results show a clear link between the intensity and CP fluctuations in a patch which corresponds to a narrow range of magnetic field inclinations. This suggests the presence of Alfvénic perturbations in the sunspot. This article is part of the Theo Murphy meeting issue ‘High-resolution wave dynamics in the lower solar atmosphere’.

中文翻译：

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太阳黑子色球层的分光偏振波动

新时代的 4 m 级太阳望远镜所取得的仪器进步具有无与伦比的分光偏振精度和灵敏度，这将使我们能够以前所未有的细节研究色球磁场及其动力学。在这方面，光谱偏振诊断可以为磁流体动力学（MHD）波过程提供宝贵的见解。MHD 波，特别是与特定波模式相关的阿尔夫涨落，最近被认为是重要的机制，不仅是太阳大气外层加热和太阳风加速的重要机制，而且也是观测到的元素丰度异常的重要机制。太阳和其他类太阳恒星的日冕（也称为第一电离势）效应。在这里，我们利用最先进和独特的分光偏振干涉二维光谱仪观测来研究太阳黑子色球层中强度和圆偏振（CP）波动之间的关系。我们的结果表明，对应于狭窄范围的磁场倾角的斑块中的强度和 CP 波动之间存在明显的联系。这表明太阳黑子中存在阿尔芬扰动。本文是 Theo Murphy 会议问题“太阳低层大气中的高分辨率波动力学”的一部分。