冕洞中射流的速度结构
Velocity Structure of Jets in Coronal Hole
摘要：
首次导出了冕洞中喷流的速度结构。日出观测揭示了冕洞中存在许多亮点。它们呈环状，有时与日冕喷流有关。利用日出号上的极紫外成像光谱仪（EIS）获得的光谱进行了分析，以推断北极地区冕洞中亮环和喷流的多普勒速度。在明亮环上方的细长喷流被发现最大蓝移了30 km/s，而明亮环的足点被红移。在日冕喷流中检测到的蓝移被解释为日冕洞中新兴通量与环境场之间的磁重联产生的上升流。
英文摘要：
Velocity structures of jets in a coronal hole have been derived for the first time. Hinode observations revealed the existence of many bright points in coronal holes. They are loop-shaped and sometimes associated with coronal jets. Spectra obtained with the Extreme ultraviolet Imaging Spectrometer (EIS) on board Hinode are analyzed to infer Doppler velocity of bright loops and jets in a coronal hole of the north polar region. Elongated jets above bright loops are found to be blue-shifted by 30 km/s at maximum, while foot points of bright loops are red-shifted. Blue-shifts detected in coronal jets are interpreted as upflows produced by magnetic reconnection between emerging flux and the ambient field in the coronal hole.
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