The effect of the compton backscattering component on the photon spectra of three Yohkoh/hard X-ray telescope 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

	The effect of the compton backscattering component on the photon spectra of three Yohkoh/hard X-ray telescope flares
	Zhang, J; Huang, GL
刊名	ASTROPHYSICAL JOURNAL
	2003-07-20
卷号	592 期号:1 页码:L49-L52
关键词	scattering Sun : flares Sun : X-rays, gamma rays
ISSN号	0004-637X
英文摘要	A study of the photon spectra of three Yohkoh/hard X-ray telescope (HXT) events at the nonthermal peak times is presented. It is found that the photon spectra are very hard (gamma similar to 2.6-3.1) and have a single power law approximately between the HXT M1 and H channels (23-93 keV). However, the photon spectra become very flattened between the HXT L and M1 channels (13-33 keV); i.e., the M1/L channel ratio is excessively large. Consequently, the observed photon spectra cannot be produced simply by a single-power-law electron spectrum with a low-energy cutoff/flattening. We understand that this property of the photon spectra may result from the superposition of a strong Compton backscattering component in the observed hard X-ray spectra. This Letter points out that the contribution of the Compton backscattering may actually be significant for the received hard X-ray emissions in the deka-keV energy range, which has been indicated by previous researchers through theoretical calculations.
学科主题	Astronomy & Astrophysics ; Mathematics
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 ; EMISSION ; ELECTRONS ; ANISOTROPY
收录类别	SCI
语种	英语
WOS记录号	WOS:000184098900013
公开日期	2012-08-08
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4614]
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.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, J,Huang, GL. The effect of the compton backscattering component on the photon spectra of three Yohkoh/hard X-ray telescope flares[J]. ASTROPHYSICAL JOURNAL,2003,592(1):L49-L52.
APA	Zhang, J,&Huang, GL.(2003).The effect of the compton backscattering component on the photon spectra of three Yohkoh/hard X-ray telescope flares.ASTROPHYSICAL JOURNAL,592(1),L49-L52.
MLA	Zhang, J,et al."The effect of the compton backscattering component on the photon spectra of three Yohkoh/hard X-ray telescope flares".ASTROPHYSICAL JOURNAL 592.1(2003):L49-L52.