Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere
文献类型：期刊论文
| 作者 | Xiao, Fuliang; Chen, Liangxu; He, Yihua |
| 刊名 | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
 |
| 出版日期 | 2011 |
| 卷号 | 73期号:1页码:88-94 |
| 关键词 | Wave-particle interaction Superluminous waves Bounce-averaged diffusion coefficients |
| ISSN号 | 1364-6826 |
| 通讯作者 | Xiao, FL (reprint author), Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China. |
| 中文摘要 | In this study, we present a first evaluation of bounce-averaged diffusion coefficients of superluminous wave (R-X and L-O) modes at two locations: L = 6.5 and 4.5. We show that, analogous to the local diffusion coefficients, bounce-averaged momentum diffusion coefficients play a dominant role for pitch angles alpha above a critical angle alpha(c), namely, < D(pp)> > vertical bar < D(p alpha)> vertical bar > < D(alpha alpha)>. We also demonstrate that for a Gaussian distribution of wave normal angle theta (X = tan theta). diffusion coefficients are sensitively dependent on the peak X(m). As X(m) increases, < D(pp)> and < D(alpha alpha)> are found to increase in cases of interest: X(m) = tan 25 degrees, tan 45 degrees and tan 65 degrees. We have estimated wave amplitudes for particular stochastic acceleration timescale for 1 MeV electrons and found that the required wave amplitudes B(te) similar to 86 to similar to 170 pT for a timescale tau = 1 day. These results indicate that superluminous wave modes may have a significant potential for both stochastic acceleration of trapped electrons (with higher pitch angles) and loss process of untrapped electrons (with smaller pitch angles). (C) 2009 Elsevier Ltd. All rights reserved. |
| 英文摘要 | In this study, we present a first evaluation of bounce-averaged diffusion coefficients of superluminous wave (R-X and L-O) modes at two locations: L = 6.5 and 4.5. We show that, analogous to the local diffusion coefficients, bounce-averaged momentum diffusion coefficients play a dominant role for pitch angles alpha above a critical angle alpha(c), namely, < D(pp)> > vertical bar < D(p alpha)> vertical bar > < D(alpha alpha)>. We also demonstrate that for a Gaussian distribution of wave normal angle theta (X = tan theta). diffusion coefficients are sensitively dependent on the peak X(m). As X(m) increases, < D(pp)> and < D(alpha alpha)> are found to increase in cases of interest: X(m) = tan 25 degrees, tan 45 degrees and tan 65 degrees. We have estimated wave amplitudes for particular stochastic acceleration timescale for 1 MeV electrons and found that the required wave amplitudes B(te) similar to 86 to similar to 170 pT for a timescale tau = 1 day. These results indicate that superluminous wave modes may have a significant potential for both stochastic acceleration of trapped electrons (with higher pitch angles) and loss process of untrapped electrons (with smaller pitch angles). (C) 2009 Elsevier Ltd. All rights reserved. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI ; EI |
| 资助信息 | National Natural Science Foundation of China [40774078, 40874076, 40931053, 40925014]; Special Fund for Public Welfare Industry (meteorology) [GYHY200806024]; Changsha University of Science and Technology; State Key Laboratories for Space Weather, Chinese Academy of Sciences |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3119]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Xiao, Fuliang,Chen, Liangxu,He, Yihua. Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere[J]. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,2011,73(1):88-94. |
| APA | Xiao, Fuliang,Chen, Liangxu,&He, Yihua.(2011).Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,73(1),88-94. |
| MLA | Xiao, Fuliang,et al."Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 73.1(2011):88-94. |
入库方式： OAI收割
来源：国家空间科学中心
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