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Bounce-averaged diffusion coefficients for superluminous wave modes in the magnetosphere
Xiao, Fuliang; Chen, Liangxu; He, Yihua; Xiao, FL (reprint author), Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
2011
Volume73Issue:1Pages:88-94
ISSN1364-6826
Language英语
KeywordWave-particle Interaction Superluminous Waves Bounce-averaged Diffusion Coefficients
AbstractIn 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.; 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.
Indexed BySCI ; EI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3119
Collection空间科学部
Corresponding AuthorXiao, FL (reprint author), Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China.
Recommended Citation
GB/T 7714
Xiao, Fuliang,Chen, Liangxu,He, Yihua,et al. 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,&Xiao, FL .(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.
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