Spectral analysis and atmospheric models of microflares

	Spectral analysis and atmospheric models of microflares
	Fang, C 1; Tang, YH 1; Xu Z(徐稚)1,2
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2006
卷号	6 期号:5 页码:597-607
关键词	Sun : Microflares Sun : spectrum Sun : semi-empirical modelling
ISSN号	1009-9271
通讯作者	Fang, C (reprint author), Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China.
产权排序	第二完成单位
英文摘要	By use of the high-resolution spectral data obtained with THEMIS on 2002 September 5, the spectra and characteristics of five well-observed microflares have been analyzed. Our results indicate that some of them are located near the longitudinal magnetic polarity inversion lines. All the microflares are accompanied by mass motions. The most obvious characteristic of the H alpha microflare spectra is the emission at the center of both H alpha and Call 8542 angstrom lines. For the first time both thermal and non-thermal semi-empirical atmospheric models for the conspicuous and faint microflares are computed. In computing the non-thermal models, we assume that the electron beam resulting from magnetic reconnection is produced in the chromosphere, because it requires lower energies for the injected particles. It is found there is obvious heating in the low chromosphere. The temperature enhancement is about 1000-2200 K in the thermal models. If the non-thermal effects are included, then the required temperature increase can be reduced by 100-150 K. These imply that the H alpha microflares can probably be produced by magnetic reconnection in the solar lower atmosphere. The radiative and kinetic energies of the Ha microflares are estimated and the total energy is found to be 10(27) - 4 x 10(28) erg.
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]	HARD X-RAY ; REGION TRANSIENT BRIGHTENINGS ; SOLAR ACTIVE-REGION ; H-ALPHA ; CHROMOSPHERIC FLARES ; ELLERMAN BOMBS ; QUIET SUN ; HYDROGEN ; POINTS
收录类别	SCI
原文出处	http://iopscience.iop.org/1009-9271/6/5/12/
语种	英语
WOS记录号	WOS:000241487800012
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6097]
专题	云南天文台_太阳物理研究组
作者单位	1.Department of Astronomy, Nanjing University, Nanjing 210093 2.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011
推荐引用方式 GB/T 7714	Fang, C,Tang, YH,Xu Z. Spectral analysis and atmospheric models of microflares[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2006,6(5):597-607.
APA	Fang, C,Tang, YH,&Xu Z.(2006).Spectral analysis and atmospheric models of microflares.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,6(5),597-607.
MLA	Fang, C,et al."Spectral analysis and atmospheric models of microflares".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 6.5(2006):597-607.