Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode)
Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode)
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DOI：
10.1051/0004-6361:200811258
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发表时间：
2009-01-01
影响因子：
6.5
通讯作者：
Potts, H. E.
中科院分区：
文献类型：
--
作者：
Attie, R.;Innes, D. E.;Potts, H. E.
上下文在太阳大气的几个层中观测到不同种类的扭转运动。色球层的太阳黑子漩涡和太阳黑子的旋转，甚至更高的低日冕S形，都是许多太阳特征的大尺度扭曲拓扑结构的例子。然而，它们在宁静光球中的大规模发生还没有被调查过。本研究揭示了存在的涡旋流位于超颗粒结的宁静太阳。我们使用了1小时和5小时的时间序列的蓝色连续和G-波段图像FG/ SOT的颗粒来推导光球流。一个功能跟踪技术称为球跟踪进行跟踪颗粒和揭示底层流场。在这两个时间序列中，我们确定了长期持续的涡流位于超颗粒交界处。第一涡流持续至少1小时，宽度约为20“（约为15.5 μ m）。第二涡流持续时间超过2小时，宽度约为27“"（约为21 μ m）。
Context. Twisting motions of different sorts are observed in several layers of the solar atmosphere. Chromospheric sunspot whorls and rotation of sunspots or even higher up in the lower corona sigmoids are examples of the large-scale twisted topology of many solar features. Nevertheless, their occurrence on a large scale in the quiet photosphere has not been investigated yet.Aims. The present study reveals the existence of vortex flows located at the supergranular junctions of the quiet Sun.Methods. We used a 1-h and a 5-h time series of the granulation in blue continuum and G-band images from FG/ SOT to derive the photospheric flows. A feature-tracking technique called balltracking was performed to track the granules and reveal the underlying flow fields.Results. In both time series, we identify long lasting vortex flow located at supergranular junctions. The first vortex flow lasts at least 1 h and is similar to 20 '' wide (similar to 15.5 Mm). The second vortex flow lasts more than 2 h and is similar to 27 '' wide (similar to 21 Mm).