Shrinking and cooling of flare loops in a two-ribbon flare

	Shrinking and cooling of flare loops in a two-ribbon flare
	Vrsnak, B 1; Temmer, M 1; Veronig, A 2; Karlicky, M 3; Lin J(林隽)4,5
刊名	SOLAR PHYSICS
	2006-04
卷号	234 期号:2 页码:273-299
ISSN号	0038-0938
通讯作者	Vrsnak, B (reprint author), Fac Geodesy, Hvar Observ, Zagreb, Croatia.
产权排序	第四完成单位
英文摘要	We analyze the evolution of the flare/postflare-loop system in the two-ribbon flare of November 3, 2003, utilizing multi-wavelength observations that cover the temperature range from several tens of MK down to 10(4) K. A non-uniform growth of the loop system enables us to identify analogous patterns in the height - time, h(t), curves measured at different temperatures. The "knees," " plateaus," and " bends" in a higher-temperature curve appear after a certain time delay at lower heights in a lower-temperature curve. We interpret such a shifted replication as a track of a given set of loops ( reconnected field lines) while shrinking and cooling after being released from the reconnection site. Measurements of the height/time shifts between h( t) curves of different temperatures provide a simultaneous estimate of the shrinkage speed and cooling rate in a given temperature domain, for a period of almost ten hours after the flare impulsive phase. From the analysis we find the following: ( a) Loop shrinkage is faster at higher temperatures - in the first hour of the loop-system growth, the shrinkage velocity at 5 MK is 20 - 30 km s(-1), whereas at 1 MK it amounts to 5 km s(-1); (b) Shrinking becomes slower as the flare decays - ten hours after the impulsive phase, the shrinkage velocity at 5 MK becomes 5 km s(-1); ( c) The cooling rate decreases as the flare decays - in the 5 MK range it is 1 MK min(-1) in the first hour of the loop-system growth, whereas ten hours later it decreases to 0.2 MK min(-1); (d) During the initial phase of the loop-system growth, the cooling rate is larger at higher temperatures, whereas in the late phases the cooling rate apparently does not depend on the temperature; ( e) A more detailed analysis of shrinking/cooling around one hour after the impulsive phase reveals a deceleration of the loop shrinkage, amounting to (a) over bar approximate to 10 m s(-2) in the T < 5 MK range; (f) In the same interval, conductive cooling dominates down to T approximate to 3 MK, whereas radiation becomes dominant below T approximate to 2 MK; (g) A few hours after the impulsive phase, radiation becomes dominant across the whole T < 5 MK range. These findings are compared with results of previous studies and discussed in the framework of relevant models.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SOLAR-FLARES ; SUPRA-ARCADE ; RECONNECTION ; MOTIONS ; PLASMA ; RADIATION ; COMPONENT ; RIBBONS ; MODELS ; ORIGIN
收录类别	SCI
原文出处	http://link.springer.com/article/10.1007%2Fs11207-006-0093-6
语种	英语
WOS记录号	WOS:000237326300005
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6092]
专题	云南天文台_太阳物理研究组
作者单位	1.Faculty of Geodesy, Hvar Observatory, Zagreb, Croatia 2.IGAM/Institute of Physics, University of Graz, Graz, Austria 3.Astronomical Institute of the Academy of Sciences of the Czech Republic, Ondřejov, Czech Republic 4.Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, Yunnan, P.R. China 5.Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, U.S.A.
推荐引用方式 GB/T 7714	Vrsnak, B,Temmer, M,Veronig, A,et al. Shrinking and cooling of flare loops in a two-ribbon flare[J]. SOLAR PHYSICS,2006,234(2):273-299.
APA	Vrsnak, B,Temmer, M,Veronig, A,Karlicky, M,&Lin J.(2006).Shrinking and cooling of flare loops in a two-ribbon flare.SOLAR PHYSICS,234(2),273-299.
MLA	Vrsnak, B,et al."Shrinking and cooling of flare loops in a two-ribbon flare".SOLAR PHYSICS 234.2(2006):273-299.