Relationship between extreme ultraviolet microflares and small-scale magnetic fields in the quiet Sun

	Relationship between extreme ultraviolet microflares and small-scale magnetic fields in the quiet Sun
	Jiang, Fayu; Zhang, Jun; Yang, Shuhong
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	2015-06-01
卷号	67 期号:3
关键词	Sun: corona Sun: flares Sun: magnetic fields
英文摘要	Microflares are small dynamic signatures observed in X-ray and extreme-ultraviolet channels. Because of their impulsive emission enhancements and wide distribution, they are thought to be closely related to coronal heating. By using the high-resolution 171 angstrom images from the Atmospheric Imaging Assembly and the lines-of-sight magnetograms obtained by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory, we trace 10794 microflares in a quiet region near the disk center with a field of view of 960 '' x 1068 '' during 24 hr. The microflares have an occurrence rate of 4.4 x 10(3) hr(-1) extrapolated over the whole Sun. Their average brightness, size, and lifetime are 1.7I(0) (of the quiet Sun), 9.6 Mm(2), and 3.6 min, respectively. There exists a mutual positive correlation between the microflares' brightness, area, and lifetime. In general, the microflares distribute uniformly across the solar disk, but form network patterns locally, which are similar to and matched with the magnetic network structures. Typical cases show that the microflares prefer to occur in magnetic cancellation regions of network boundaries. We roughly calculate the upper limit of energy flux supplied by the microflares and find that the result is still a factor of similar to 15 below the coronal heating requirement.
收录类别	SCI
语种	英语
WOS记录号	WOS:000356182500011
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5695]
专题	国家天文台_太阳物理研究部
作者单位	Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Fayu,Zhang, Jun,Yang, Shuhong. Relationship between extreme ultraviolet microflares and small-scale magnetic fields in the quiet Sun[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2015,67(3).
APA	Jiang, Fayu,Zhang, Jun,&Yang, Shuhong.(2015).Relationship between extreme ultraviolet microflares and small-scale magnetic fields in the quiet Sun.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,67(3).
MLA	Jiang, Fayu,et al."Relationship between extreme ultraviolet microflares and small-scale magnetic fields in the quiet Sun".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 67.3(2015).