Large-scale active coronal phenomena in Yohkoh SXT images
Large-scale active coronal phenomena in Yohkoh SXT images
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Yohkoh SXT 图像中的大规模活跃日冕现象
DOI：
10.1007/bf00148059
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发表时间：
1996
期刊：
影响因子：
2.8
通讯作者：
Y. Uchida
中科院分区：
文献类型：
--
作者：
F. Fárník;Z. Svestka;H. Hudson;Y. Uchida
我们讨论了1992年5月3-6日发生的静止巨型耀斑后拱的Yohkoh SXT观测，并详细研究了与5月5日19：02 UT的耀斑有关的最后一个拱，它在西翼上方延伸。这座拱门与1980年5月21日至22日在SMM上发现的第一座巨型拱门相似。我们证明，这些结构的长寿命必然意味着额外的能量输入从下面的活动区域：否则，传导将冷却这些拱门在不到一个小时，甚至与不太可能的假设传导抑制，纯辐射冷却不会产生观察到的温度下降。所有的拱顶，虽然亮度不同，但在10万公里的高度上停留了几天，5月5日至6日研究的拱只是先前存在的腐烂结构的一个新的亮度。增亮显然是由于耀斑区域热等离子体的流入。Yohkoh的数据证实，这些固定拱是罕见的现象相比，上升拱研究论文I和内田等人。正在扩大活跃区域。
We discuss Yohkoh SXT observations of stationary giant post-flare arches which occurred on 3–6 May, 1992 and study in detail the last arch, associated with the flare at 19:02 UT on 5 May, which extended above the west limb. The arch was similar to the first giant arch discovered on board the SMM, on 21–22 May, 1980. We demonstrate that the long lifetimes of these structures necessarily imply additional energy input from the underlying active region: otherwise, conduction would cool these arches in less than one hour and even with the unlikely assumption of conduction inhibited, pure radiative cooling would not produce the temperature decrease observed. All arch tops, although varying in brightness, stayed for several days at a fairly constant altitude of ∼ 100 000 km, and the arch studied, on 5–6 May, was just a new brightening of the pre-existing decaying structure. The brightening was apparently due to inflow of hot plasma from the flare region. Yohkoh data confirm that these stationary arches are rare phenomena when compared with the rising arches studied in Paper I and with Uchida et al.'s expanding active regions.