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	Upflows in the upper transition region of the quiet Sun
	Tian, H. ; Tu, C.Y. ; Marsch, E. ; He, J.S. ; Zhou, C. ; Zhao, L.
	2010
关键词	Sun: corona Sun: transition region Sun: UV radiation Sun: magnetic fields Sun: solar wind ULTRAVIOLET EMISSION-LINES SOLAR-WIND CORONAL HOLES MAGNETIC-FIELDS NETWORK HEIGHTS LOOPS
英文摘要	We investigate the physical meaning of the prominent blue shifts of Ne VIII, which is observed to be associated with quiet-Sun network junctions (boundary intersections), through data analyses combining force-free-field extrapolations with EUV spectroscopic observations. For a middle-latitude region, we reconstruct the magnetic funnel structure in a sub-region showing faint emission in EIT-Fe 195. This funnel appears to consist of several smaller funnels that originate from network lanes, expand with height and finally merge into a single wide open-field region. However, the large blue shifts of Ne VIII are generally not associated with open fields, but seem to be associated with the legs of closed magnetic loops. Moreover, in most cases significant upflows are found in both of the funnel-shaped loop legs. These quasi-steady upflows are regarded as signatures of mass supply to the coronal loops rather than the solar wind. Our observational result also reveals that in many cases the upflows in the upper transition region (TR) and the downflows in the middle TR are not fully cospatial. Based on these new observational results, we suggest different TR structures in coronal holes and in the quiet Sun.; Astronomy & Astrophysics; CPCI-S(ISTP); 3
语种	英语
DOI标识	10.1063/1.3395877
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311970]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Tian, H.,Tu, C.Y.,Marsch, E.,et al. Upflows in the upper transition region of the quiet Sun. 2010-01-01.

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