EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳活动的多波段观测研究团组

	EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES
	Shen, Jinhua 1,2; Zhou, Tuanhui2 ; Ji, Haisheng2,3 ; Wang, Na 1; Cao, Wenda 3; Wang, Haimin 3
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2008-10-10
卷号	686 期号:1 页码:L37-L40
关键词	Sun: flares Sun: magnetic fields Sun: X-rays, gamma rays
ISSN号	2041-8205
英文摘要	This Letter is to investigate the physics of a newly discovered phenomenon-contracting flare loops in the early phase of solar flares. In classical flare models, which were constructed based on the phenomenon of the expansion of flare loops, an energy releasing site is put above flare loops. These models can predict that there is a vertical temperature gradient in the top of flare loops due to heat conduction and cooling effects. Therefore, the centroid of an X-ray loop-top source at higher energy bands will be higher in altitude, which we can define as the normal temperature distribution. With observations made by RHESSI, we analyzed 10 M- or X-class flares (9 limb flares). For all these flares, the movement of loop-top sources shows an obvious U-shaped trajectory, which we take as the signature of contraction-to-expansion of flare loops. We find that, for all these flares, a normal temperature distribution does exist, but only along the path of expansion. The temperature distribution along the path of contraction is abnormal, showing no spatial order at all. The result suggests that magnetic reconnection processes in the contraction and expansion phases of these solar flares are different.
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]	MAGNETIC RECONNECTION ; CURRENT SHEET ; RHESSI ; RELAXATION ; SIGNATURE
收录类别	SCI
语种	英语
WOS记录号	WOS:000262731200010
公开日期	2011-12-30
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/2017]
专题	紫金山天文台_太阳活动的多波段观测研究团组
作者单位	1.Natl Astron Observ, Urumqi Observ, Urumqi 830011, Peoples R China 2.Purple Mt Observ, Nanjing 210008, Peoples R China 3.New Jersey Inst Technol, Ctr Solar Terr Res, Newark, NJ 07102 USA
推荐引用方式 GB/T 7714	Shen, Jinhua,Zhou, Tuanhui,Ji, Haisheng,et al. EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES[J]. ASTROPHYSICAL JOURNAL LETTERS,2008,686(1):L37-L40.
APA	Shen, Jinhua,Zhou, Tuanhui,Ji, Haisheng,Wang, Na,Cao, Wenda,&Wang, Haimin.(2008).EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES.ASTROPHYSICAL JOURNAL LETTERS,686(1),L37-L40.
MLA	Shen, Jinhua,et al."EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES".ASTROPHYSICAL JOURNAL LETTERS 686.1(2008):L37-L40.