Fine-Scale Structures of the Evershed Effect Observed by the Solar Optical Telescope aboard Hinode
Fine-Scale Structures of the Evershed Effect Observed by the Solar Optical Telescope aboard Hinode
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DOI：
10.1093/pasj/59.sp3.s593
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发表时间：
2007-11
影响因子：
2.3
通讯作者：
K. Ichimoto;R. Shine;B. Lites;M. Kubo;T. Shimizu;Y. Suematsu;S. Tsuneta;Y. Katsukawa;T. Tarbell;A. Title;S. Nagata;T. Yokoyama;M. Shimojo
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文献类型：
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作者：
K. Ichimoto;R. Shine;B. Lites;M. Kubo;T. Shimizu;Y. Suematsu;S. Tsuneta;Y. Katsukawa;T. Tarbell;A. Title;S. Nagata;T. Yokoyama;M. Shimojo
正在使用Hinode上的太阳光学望远镜的光谱偏振仪和宽带滤光片成像仪所获得的数据来研究埃弗谢德效应的小尺度结构。我们发现，恒雨流开始于向内迁移的明亮半影颗粒的前沿，并优先在半影暗通道中转向接近水平的流动。在分布在半影上的深层光球层中，发现了一些向上运动1公里的细长小区域。它们以明亮的颗粒同空间分布，具有相对水平的磁场。在太阳黑子的中部和外部半影中也发现了一些与太阳黑子相反磁极有关的强烈向下运动的斑块。它们可以被识别为埃弗谢德流道的脚点，尽管识别单个对流道并不简单。我们的结果为地面高分辨率观测的一些最新发现提供了强有力的支持，并与众所周知的半影未梳理结构的图像基本一致，其中半影由上升的通量管组成，携带着嵌入在更垂直的背景磁场中的近水平的恒定流。
The small-scale structure of the Evershed effect is being studied using data obtained by the Spectropolarimeter and the Broadband Filter Imager of the Solar Optical Telescope aboard Hinode. We find that the Evershed flow starts at the leading edge of inwardly migrating bright penumbral grains, and turns to nearly a horizontal flow preferentially in the dark lanes of the penumbra. A number of small elongated regions that have an upward motion of 1 km s 1 are found in the deep photosphere distributed over the penumbra. They are cospatial with bright grains and have relatively horizontal magnetic fields. A number of patches having a strong downward motion associated with the opposite magnetic polarity from the sunspot are also found in the mid and outer penumbra. They could be identified as foot points of the Evershed flow channels, though the identification of individual pairs is not straightforward. Our results provide strong support for some recent findings from ground-based high-resolution observations, and are in general agreement with the well-known picture of the uncombed structure of the penumbra, in which the penumbrae consist of rising flux tubes carrying nearly horizontal Evershed flows embedded in more vertical background magnetic fields.