日出星本影精细结构的分光偏振测量：磁对流的证据
Spectropolarimetery of umbral fine structures from Hinode: Evidence for magnetoconvection
摘要：
我们提出了分光偏振分析的阴影点和光桥片段，显示在G-波段图像中的暗巷。阴影点显示了上升流以及在其中心部分的正斯托克斯V区的不对称性。较大的阴影点显示了其周围部分的下降流斑块，这些斑块与负Stokes V面积不对称性有关。阴影点显示中心部分的磁场较弱，而外围区域的磁场较高。在全圆偏振光中，阴影精细结构比在连续强度中更好地可见。阴影点显示暗泳道上方的温度不足。磁场倾角显示在本影点和轻桥碎片上方的尖点结构。我们比较我们的观测结果与三维磁流体动力学模拟。
英文摘要：
We present spectropolarimetric analysis of umbral dots and a light bridge fragment that show dark lanes in G-band images. Umbral dots show upflow as well as associated positive Stokes V area asymmetry in their central parts. Larger umbral dots show down flow patches in their surrounding parts that are associated with negative Stokes V area asymmetry. Umbral dots show weaker magnetic field in central part and higher magnetic field in peripheral area. Umbral fine structures are much better visible in total circularly polarized light than in continuum intensity. Umbral dots show a temperature deficit above dark lanes. The magnetic field inclination show a cusp structure above umbral dots and a light bridge fragment. We compare our observational findings with 3D magnetohydrodynamic simulations.
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