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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Formation process of a light bridge revealed with the Hinode Solar Optical Telescope
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Formation process of a light bridge revealed with the Hinode Solar Optical Telescope

机译：Hinode太阳光学望远镜揭示的光桥形成过程

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The Solar Optical Telescope (SOT) on-board Hinode successfully and continuously observed the formation process of a light bridge in a matured sunspot of the NOAA active region 10923 for several days with high spatial resolution. During its formation, many umbral dots were observed to be emerging from the leading edges of penumbral filaments, and rapidly intruding into the umbra. The precursor of the light bridge formation was also identified as a relatively slow inward motion of the umbral dots, which emerged not near the penumbra, but inside the umbra. The spectro-polarimeter on SOT provided physical conditions in the photosphere around the umbral dots and the light bridges. We found that the light bridges and the umbral dots had significantly weaker magnetic fields associated with upflows relative to the core of the umbra, which implies that there was hot gas with weak field strength penetrating from the subphotosphere to near the visible surface inside those structures. There needs to be a mechanism to drive the inward motion of the hot gas along the light bridges. We suggest that the emergence and the inward motion are triggered by a buoyant penumbral flux tube as well as subphotospheric flow crossing the sunspot.
机译：机载太阳探测器上的太阳光学望远镜（SOT）成功地连续几天以高空间分辨率观察了NOAA有源区10923的成熟黑子中光桥的形成过程。在其形成过程中，观察到许多本影点从半影丝的前缘出现，并迅速侵入本影。光桥形成的前体也被认为是本影点的相对缓慢的向内运动，该影点不是出现在半影附近而是出现在本影内部。 SOT上的分光偏振计为光点周围的本影点和光桥提供了物理条件。我们发现，相对于本影的核心，光桥和本影点的磁场与上流相关联的磁场明显弱，这意味着存在从弱光子层穿透到这些结构内部可见表面附近的弱场强的热气体。需要一种机制来驱动热气沿着光桥向内运动。我们建议出现和向内运动是由浮力半影通量管以及穿过黑子的亚光圈流触发的。

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