Sunspots have played a key role in aiding our understanding of magnetohydrodynamic (MHD) wave phenomena in the Sun’s atmosphere, and it is well known they demonstrate a number of wave phenomena associated with slow MHD modes. Recent studies have shown that transverse wave modes are present throughout the majority of the chromosphere. Using high-resolution Ca II 8542 Å observations from the Swedish Solar Telescope, we provide the first demonstration that the chromospheric super-penumbral fibrils, which span out from the sunspot, also show ubiquitous transverse motions. We interpret these motions as transverse waves, in particular the MHD kink mode. We compile the statistical properties of over 2000 transverse motions to find distributions for periods and amplitudes, finding they are broadly consistent with previous observations of chromospheric transverse waves in quiet Sun fibrils. The very presence of the waves in super-penumbral fibrils raises important questions about how they are generated, and could have implications for our understanding of how MHD wave energy is transferred through the atmosphere of a 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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太阳黑子超半影原纤维的横向运动

太阳黑子在帮助我们了解太阳大气中的磁流体动力学 (MHD) 波现象方面发挥了关键作用，众所周知，它们展示了许多与慢 MHD 模式相关的波现象。最近的研究表明，横波模式存在于色球的大部分区域。利用瑞典太阳望远镜的高分辨率 Ca II 8542 Å 观测，我们首次证明了从太阳黑子延伸出来的色球超半影原纤维也显示出无处不在的横向运动。我们将这些运动解释为横波，特别是 MHD 扭结模式。我们汇编了 2000 多个横向运动的统计特性，以找到周期和幅度的分布，发现它们与先前在安静的太阳原纤维中观察到的色球横波大致一致。超半影原纤维中波的存在引发了关于它们是如何产生的重要问题，并且可能对我们理解 MHD 波能量如何通过太阳黑子的大气层传输产生影响。本文是 Theo Murphy 会议问题“低太阳大气中的高分辨率波浪动力学”的一部分。