On active region loops: Hinode/EIS observations
On active region loops: Hinode/EIS observations
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DOI：
10.1088/0004-637x/694/2/1256
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
D. Tripathi;H.E.Mason;B.N.Dwivedi;G. Zanna;P. Young
中科院分区：
文献类型：
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作者：
D. Tripathi;H.E.Mason;B.N.Dwivedi;G. Zanna;P. Young
我们利用Hinode上的极紫外成像光谱仪（EIS）的观测结果，使用2007年5月19日观测到的活动区域的1 ′′光栅数据，对活动区域环进行了研究。我们发现，在较冷的谱线（-1MK）中清晰可辨的活动区结构在较高的温度（-2MK）下变得“模糊”。活动区域由核心的红移排放（下行流）和边界的蓝移排放（上行流）组成。在冕环脚点附近的两个区域，流速的估算结果表明，在过渡区温度下，辐射发生红移，而在日冕温度下，辐射发生蓝移。在这些上升流速度
We have carried out a study of active region loops using observations from the Extreme-ultraviolet Imaging Spectrometer (EIS) on board Hinode using 1 ′′ raster data for an active region observed on May 19, 2007. We find that active region structures which are clearly discernible in cooler lines (� 1MK) become ’fuzzy’ at higher temperatures (� 2MK). The active region was comprised of red-shifted emissions (downflows) in the core and blue-shifted emissions (upflows) at the boundary. The flow velocities estimated in two regions located near the foot points of coronal loop showed red-shifted emission at transition region temperature and blue shifted emission at coronal temperature. The upflow speed in these