小三角斑中光球剪切流的二维光谱
Two-Dimensional Spectroscopy of Photospheric Shear Flows in a Small delta Spot
摘要：
在最近对复杂活动区域的高分辨率观测中，在主要耀斑中发现了持久和明确的强流区域，并与可见光，近红外和X射线辐射的明亮内核有关。这些流动发生在磁中性线附近，对磁剪切的产生有很大的贡献。这些剪切流的特征是强烈弯曲的半影细丝，几乎与黑子本影相切，而不是典型的径向平行结构。太阳活动区NOAA 10756是一个中等复杂的β-三角洲太阳黑子群，它提供了一个机会，将以前对这种剪切流的研究扩展到更安静的环境。我们认为剪切流是复杂活动区和三角洲点的一种普遍现象。然而，它们不一定是火炬的先决条件。实际上，在目前的观测中，沿磁中性线的光球切变流与局部磁切变的任何变化都没有关系。我们目前的高分辨率观测NOAA 10756获得的65厘米真空反射器在大熊太阳天文台（BBSO）。结合时间序列的散斑重建白光图像和二维光谱数据，研究了β-δ太阳黑子群三维矢量流场的时间演化。获得了一小时长的高质量数据集，其节奏优于30秒，空间分辨率为亚弧秒。
英文摘要：
In recent high-resolution observations of complex active regions, long-lasting and well-defined regions of strong flows were identified in major flares and associated with bright kernels of visible, near-infrared, and X-ray radiation. These flows, which occurred in the proximity of the magnetic neutral line, significantly contributed to the generation of magnetic shear. Signatures of these shear flows are strongly curved penumbral filaments, which are almost tangential to sunspot umbrae rather than exhibiting the typical radial filamentary structure. Solar active region NOAA 10756 was a moderately complex, beta-delta sunspot group, which provided an opportunity to extend previous studies of such shear flows to quieter settings. We conclude that shear flows are a common phenomenon in complex active regions and delta spots. However, they are not necessarily a prerequisite condition for flaring. Indeed, in the present observations, the photospheric shear flows along the magnetic neutral line are not related to any change of the local magnetic shear. We present high-resolution observations of NOAA 10756 obtained with the 65-cm vacuum reflector at Big Bear Solar Observatory (BBSO). Time series of speckle-reconstructed white-light images and two-dimensional spectroscopic data were combined to study the temporal evolution of the three-dimensional vector flow field in the beta-delta sunspot group. An hour-long data set of consistent high quality was obtained, which had a cadence of better than 30 seconds and sub-arcsecond spatial resolution.
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