Properties of the He I 10830 angstrom Line in Solar Flares

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳高能及相关物理过程研究团组

	Properties of the He I 10830 angstrom Line in Solar Flares
	Du, Qiu-Sheng; Li, Hui
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2008
卷号	8 期号:6 页码:723-731
关键词	Sun: flares Sun: infrared line: profiles
ISSN号	1009-9271
英文摘要	We study the properties of the He 1 10830 A line in nine selected solar flares, using spectral data obtained with the Multi-channel Infrared Solar Spectrograph (MISS) at Purple Mountain Observatory (PMO) and photospheric images from the Michelson Doppler Imager (MDI) onboard the Solar and Heliospheric Observatory (SOHO). Our results indicate that, over an area of 3 ''-8 '', the He I 10830 angstrom line shows emission exceeding the continuum in nearby quiet region when the Geostationary Operations Environmental Satellite (GOES) Xray class of the flare reaches a threshold value (C4.5). The He I 10830 angstrom line emission is detected only in the kernels of the Het, brightenings, but is not associated with the size of the flare. It is found that, whenever the He I 10830 angstrom line shows excess emission over the nearby continuum both the Ha and the Ca II 8542 angstrom lines display enhanced intensities exceeding their preflare intensities. The He I 10830 angstrom line emission can occasionally extend into the umbra of the involved sunspot, which is inconsistent with previous studies. The weak component of He I 10830 angstrom line changes from emission to absorption earlier than does the main component. Our results favor the photoionization-reconnection mechanism for the excitation of the He I 10830 angstrom line.
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]	16 AUGUST 1989 ; LIMB FLARE ; ELECTRON-BEAM ; SPECTROMETER ; DIAGNOSTICS ; ATMOSPHERE ; DYNAMICS ; SPECTRA ; MODEL
收录类别	SCI
语种	英语
WOS记录号	WOS:000262268400012
公开日期	2011-12-29
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1889]
专题	紫金山天文台_太阳高能及相关物理过程研究团组
作者单位	Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Du, Qiu-Sheng,Li, Hui. Properties of the He I 10830 angstrom Line in Solar Flares[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2008,8(6):723-731.
APA	Du, Qiu-Sheng,&Li, Hui.(2008).Properties of the He I 10830 angstrom Line in Solar Flares.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,8(6),723-731.
MLA	Du, Qiu-Sheng,et al."Properties of the He I 10830 angstrom Line in Solar Flares".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 8.6(2008):723-731.