A study of the mechanism of acceleration of He-3 and heavy ions by Alfven turbulence in impulsive flares

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳和太阳系等离子体研究团组

	A study of the mechanism of acceleration of He-3 and heavy ions by Alfven turbulence in impulsive flares
	Wu, GP ; Wang, DY ; Xu, AA ; Tang, YH
刊名	CHINESE ASTRONOMY AND ASTROPHYSICS
	2002-07-01
卷号	26 期号:3 页码:301-307
关键词	He-rich event turbulent acceleration energy spectrum of particles
ISSN号	0275-1062
英文摘要	Prompted by the observational result that in He-3-rich events the energetic He-3 and heavy ions exhibit similar power-law distributions, we study by means of numerical solution of Fokker-Planck equation, the characteristics of the evolution of the distribution of ions after they are accelerated by Alfven turbulence. The results of computation show that the plasma density in the source region of acceleration and the energy density of Alfven turbulence play the chief role in the energy spectrum of the particles. For a plasma density n = (0.1 - 1) 10(10) cm(-3) a magnetic field B = 50 - 100 G and a turbulence energy density 0.4-2 ergs cm(-3) the turbulent Alfven waves can accelerate He-3 and heavy ions to the order of magnitude of 10 MeV/nucleon then in about 1 second. The index of the energy spectrum is 2.0-3-5. The result of the theoretical calculation basically agrees with the observation.
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]	SOLAR PARTICLE EVENTS ; HE-3-RICH EVENTS ; HYDROGEN ; WAVES
收录类别	SCI
语种	英语
WOS记录号	WOS:000177827900006
公开日期	2013-01-29
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/7788]
专题	紫金山天文台_太阳和太阳系等离子体研究团组
作者单位	1.SE Univ, Dept Phys, Nanjing 210096, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Wu, GP,Wang, DY,Xu, AA,et al. A study of the mechanism of acceleration of He-3 and heavy ions by Alfven turbulence in impulsive flares[J]. CHINESE ASTRONOMY AND ASTROPHYSICS,2002,26(3):301-307.
APA	Wu, GP,Wang, DY,Xu, AA,&Tang, YH.(2002).A study of the mechanism of acceleration of He-3 and heavy ions by Alfven turbulence in impulsive flares.CHINESE ASTRONOMY AND ASTROPHYSICS,26(3),301-307.
MLA	Wu, GP,et al."A study of the mechanism of acceleration of He-3 and heavy ions by Alfven turbulence in impulsive flares".CHINESE ASTRONOMY AND ASTROPHYSICS 26.3(2002):301-307.