On the positronium continuum and 0.511 MeV 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

	On the positronium continuum and 0.511 MeV line in solar flares
	Gan, WQ; Chang, J; Li, YP; Su, Y ; Miroshnichenko, LI
刊名	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2004-08-01
卷号	4 期号:4 页码:357-364
关键词	sun : flares sun : X-rays, gamma-rays
ISSN号	1009-9271
英文摘要	We have studied the influence of the density of the annihilation region on the positronium continuum. A relation between the ratio 3gamma/2gamma and the density is explicitly given, with which one can derive directly from the observed 3gamma/2gamma the density where the annihilation occurs. A unique solution may be found from the observed width of the 0.511 MeV line. We applied the method to three flares observed by GRS/SMM. It is shown that due to the measuring uncertainties in the 0.511 MeV line width, we cannot distinguish a chromospheric source from a coronal source, though both accurately localized. To improve the measuring accuracy of the 0.511 MeV line and the ratio 3gamma/2gamma will be an important step for a better understanding of the annihilation process in solar flares.
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]	CHROMOSPHERIC FLARE ; MAXIMUM-MISSION ; MAGNETIC LOOPS ; EMISSION ; MODELS
收录类别	SCI
语种	英语
WOS记录号	WOS:000223524200007
公开日期	2012-12-22
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/7726]
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.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.IZMIRAN, Troitsk 142190, Moscow Region, Russia
推荐引用方式 GB/T 7714	Gan, WQ,Chang, J,Li, YP,et al. On the positronium continuum and 0.511 MeV line in solar flares[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2004,4(4):357-364.
APA	Gan, WQ,Chang, J,Li, YP,Su, Y,&Miroshnichenko, LI.(2004).On the positronium continuum and 0.511 MeV line in solar flares.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,4(4),357-364.
MLA	Gan, WQ,et al."On the positronium continuum and 0.511 MeV line in solar flares".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 4.4(2004):357-364.