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. |
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