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arXiv 0709.3451astro-ph
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宁静太阳过渡区圈光球足点的搜索

Search for photospheric footpoints of quiet Sun transition region loops

J. Sanchez Almeida, L. Teriaca, P. Suetterlin, D. Spadaro, U. Schuehle, R. J. Rutten

摘要:

背景:安静的太阳过渡区(TR)环的足迹似乎与传统低灵敏度磁图中出现的光球磁结构不一致。目标:利用G波段亮点作为光球磁场浓度的代用指标,寻找至今尚未确定的TR环光球足点。方法:比较TR测量与SoHO/SUMER和光球磁场观测与荷兰开放望远镜。结果:光球BPs与明亮的TR结构相关,但它们似乎避开了结构中最亮的部分。BPs出现在全球红移的区域,但它们避免了极端的速度。TR爆炸事件与BP没有明确的联系。结论:这些观察结果与作为TR环足点的BP并不矛盾,尽管我们还没有成功地唯一识别出具有特定TR环的特定BP。

英文摘要:

CONTEXT:The footpoints of quiet Sun Transition Region (TR) loops do not seem to coincide with the photospheric magnetic structures appearing in traditional low-sensitivity magnetograms. AIMS: To look for the so-far unidentified photospheric footpoints of TR loops using G-band bright points (BPs) as proxies for photospheric magnetic field concentrations. METHODS: Comparison of TR measurements with SoHO/SUMER and photospheric magnetic field observations obtained with the Dutch Open Telescope. RESULTS: Photospheric BPs are associated with bright TR structures, but they seem to avoid the brightest parts of the structure. BPs appear in regions that are globally redshifted, but they avoid extreme velocities. TR explosive events are not clearly associated with BPs. CONCLUSIONS: The observations are not inconsistent with the BPs being footpoints of TR loops, although we have not succeeded to uniquely identify particular BPs with specific TR loops.

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