Observations of H-alpha surges and ultraviolet jets above satellite sunspots

	Observations of H-alpha surges and ultraviolet jets above satellite sunspots
	Chen HD(陈华东); Jiang YC(姜云春); Ma SL(马素丽)
刊名	ASTRONOMY & ASTROPHYSICS
	2008-02
卷号	478 期号:3 页码:907-913
关键词	sun : activity sun : chromosphere sun : magnetic fields sun : UV radiation
ISSN号	0004-6361
通讯作者	Chen, HD (reprint author), Chinese Acad Sci, Yunnan Observ Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Aims To know more about the physical origin of surges and jets, we investigated seven successive surge events, which occurred above the satellite sunspots of active region NOAA 10720 on 2005 January 15. Methods. Using data from the Transition Region and Coronal Explorer (TRACE), Big Bear Solar Observatory (BBSO) and Solar and Heliospheric Observatory (SOHO), we present a detailed study of the surges and their relations with the associated small arch filament, UV jets, flares and photospheric longitudinal magnetic fields. Results. The seven H-alpha surges we studied repeatedly occurred where the photospheric longitudinal fluxes of opposite magnetic polarities emerged, converged and were canceled by each other. Correspondingly, a small satellite spot emerged, decayed and disappeared during a period of about 2 hours in the white-light observations. In morphology, all surges displayed almost linear ejective structures. Their dynamic properties, such as the transverse velocity, projected maximum length and lifetime, varied in wide ranges. They are 30 -200 km s(-1), 38 000-220 000 km and from several to tens of minutes, respectively. Correspondingly, the intensities of their correlated microflares were different too. The surges of major velocities or maximum lengths seemed to be accompanied by processes of more energy release. Prior to these surge events, a small H-alpha arch filament connecting the opposite flux elements was found at the base region. Instead of erupting completely, it gradually disappeared during the surges. Its role in the surge activities is very like a bipolar flux, which contained the cool plasma and reconnected with the ambient magnetic fields. In 1600 angstrom, three surge events exhibited the composite structures of bright jets and nearby small flaring loops, which provides direct evidence of magnetic reconnection origin of the surges. A careful comparison revealed that the ends of the arch filament, the UV jets and the small flaring loops just corresponded to the interacting longitudinal fluxes in the photosphere. Conclusions. These observational results support the magnetic reconnection model of surges and jets.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	X-RAY JETS ; EMERGING FLUX REGION ; MAGNETIC RECONNECTION ; EXTREME-ULTRAVIOLET ; ACTIVE REGION ; MARCH 19 ; CANCELLATIONS ; TELESCOPE ; EJECTIONS ; EVOLUTION
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2008/06/aa8641-07/aa8641-07.html
语种	英语
WOS记录号	WOS:000252713200024
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6127]
专题	云南天文台_太阳物理研究组
推荐引用方式 GB/T 7714	Chen HD,Jiang YC,Ma SL. Observations of H-alpha surges and ultraviolet jets above satellite sunspots[J]. ASTRONOMY & ASTROPHYSICS,2008,478(3):907-913.
APA	陈华东,姜云春,&马素丽.(2008).Observations of H-alpha surges and ultraviolet jets above satellite sunspots.ASTRONOMY & ASTROPHYSICS,478(3),907-913.
MLA	陈华东,et al."Observations of H-alpha surges and ultraviolet jets above satellite sunspots".ASTRONOMY & ASTROPHYSICS 478.3(2008):907-913.