An improved method to derive the lower energy cutoff of non-thermal electrons from hard X-rays of 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

	An improved method to derive the lower energy cutoff of non-thermal electrons from hard X-rays of solar flares
	Gan, WQ; Li, YP; Chang, J; McTiernan, JM
刊名	SOLAR PHYSICS
	2002-05-01
卷号	207 期号:1 页码:137-147
关键词	NONTHERMAL ELECTRONS CHROMOSPHERIC CONDENSATION SPECTRA EMISSION MODELS
ISSN号	0038-0938
英文摘要	By changing a dimensionless calculation to a dimensional one, introducing a more accurate bremsstrahlung cross section, and using a more reasonable fitting energy range, we have recalculated the hard X-ray bremsstrahlung produced by a beam of power-law electrons with a lower energy cutoff (E-c). The method to deduce E-c from the hard X-ray spectral observations has therefore been refined in comparison with our previous one. The universality of this method has been clarified and discussed. We have applied this improved method to the 54 BATSE/Compton Gamma Ray Observatory (CGRO) hard X-ray events. It was found that about 44% of sample hard X-ray spectra can be directly explained by a beam of power-law electrons with a lower energy cutoff. The value of E-c, varying from 45 keV to 97 keV, is on average 60 keV. Another 44% of sample hard X-ray spectra might be explained by a beam of power-law electrons with the energy cutoff lower than 45 keV, which is however beyond the availability of BATSE/CGRO. Still another 11% sample hard X-ray spectra cannot be explained by a beam of power-law electrons with a lower energy cutoff. These results, based on the lower energy resolution data, however, should be compared in the future with that based on a higher energy resolution data, like the data from HESSI.
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]	NONTHERMAL ELECTRONS ; CHROMOSPHERIC CONDENSATION ; SPECTRA ; EMISSION ; MODELS
收录类别	SCI
语种	英语
WOS记录号	WOS:000175763600011
公开日期	2013-01-29
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/7924]
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	1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100864, Peoples R China 3.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Gan, WQ,Li, YP,Chang, J,et al. An improved method to derive the lower energy cutoff of non-thermal electrons from hard X-rays of solar flares[J]. SOLAR PHYSICS,2002,207(1):137-147.
APA	Gan, WQ,Li, YP,Chang, J,&McTiernan, JM.(2002).An improved method to derive the lower energy cutoff of non-thermal electrons from hard X-rays of solar flares.SOLAR PHYSICS,207(1),137-147.
MLA	Gan, WQ,et al."An improved method to derive the lower energy cutoff of non-thermal electrons from hard X-rays of solar flares".SOLAR PHYSICS 207.1(2002):137-147.