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Recent High Resolution Observations and Interpretations of Sunspot Fine Structure

机译:最近的高分辨率观测和解释太阳黑子精细结构

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We review analyses made of highly resolved filtergrams, magnetograms and Dopplergrams of sunspots, recorded with the Swedish 1-meter Solar Telescope (SST) on La Palma. Dark cores in penumbral filaments are shown to be directly linked to peripheral umbral dots and to dark lanes in light bridges, suggesting similar or related underlying physics. The visibility of dark cores is found to depend strongly on the azimuth angle already for spots located at small heliocentric distances. It is shown that dark cores are clearly visible close to the center of the Ca II H line, formed approximately 150-200 km above the photosphere. We conclude that the T 1 layer of dark-cored filaments outlines a strongly warped surface, consistent with the finding that the magnetic field strength is strongly reduced in dark cores. We show that several properties of dark-cored filaments derived from SST data are consistent with results of inversions of low-resolution Stokes spectra, but also find important discrepancies with the interpretation that penumbral filaments can be identified with flux tubes. Our data are consistent with the model proposed by Spruit Scharmer (2006), explaining dark cores as signatures of field-free convection occurring just below the visible surface of the penumbra. We discuss recent simulations of light bridges and umbral dots, providing additional support to that model.
机译:我们审查了由La Palma上的瑞典1米太阳能望远镜(SST)记录了高度解决的滤波图,磁图和Dopplargram的分析。 Penumbral长丝中的暗核被显示为与外围覆盖点直接连接到光桥中的暗通道,暗示类似或相关的潜在物理学。发现暗核的可见性被发现强烈地依赖于位于小天真距离的斑点的方位角上。结果表明,暗芯靠近CA II H线的中心清晰可见,在Photosphere上方形成约150-200公里。我们得出结论,暗芯长丝的T 1层概述了强烈翘曲的表面,与发现磁场强度在暗核中强烈降低的情况一致。我们表明,源自SST数据的暗核细丝的几种性质与低分辨率斯托克斯光谱的逆转结果一致,但也发现了对Penumbral长丝可以用通量管鉴定的解释的重要差异。我们的数据与Spruit Scharmer(2006)提出的模型一致,解释了黑暗核心,作为仅在Penumbra的可见表面下方发生的免现场对流的签名。我们讨论最近对光桥和翁布线点的模拟,为该模型提供了额外的支持。

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