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DOI | 10.1002/2017GL075788 |
Resonant Scattering of Radiation Belt Electrons by Off-Equatorial Magnetosonic Waves | |
Ni, Binbin; Zou, Zhengyang; Fu, Song; Cao, Xing; Gu, Xudong; Xiang, Zheng | |
2018-02-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:3页码:1228-1236 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Fast magnetosonic (MS) waves are commonly regarded as electromagnetic waves that are characteristically confined within +/- 3 degrees of the geomagnetic equator. We report two typical off-equatorial MS events observed by Van Allen Probes, that is, the 8 May 2014 event that occurred at the geomagnetic latitudes of 7.5 degrees-9.2 degrees both inside and outside the plasmasphere with the wave amplitude up to 590 pT and the 9 January 2014 event that occurred at the latitudes of-(15.7 degrees-17.5 degrees) outside the plasmasphere with a smaller amplitude about 81 pT. Detailed test particle simulations quantify the electron resonant scattering rates by the off-equatorial MS waves to find that they can cause the pitch angle scattering and momentum diffusion of radiation belt electrons with equatorial pitch angles < -75 degrees or < -58 degrees (depending on the wave latitudinal coverage) on timescales of a day. Subsequent two-dimensional Fokker-Planck diffusion simulations indicate that the strong off-equatorial MS waves are capable of efficiently transporting high pitch angle electrons to lower pitch angles to facilitate the formation of radiation belt electron butterfly distributions for a broad energy range from similar to 100keV to >1 MeV within an hour. Our study clearly demonstrates that the presence of off-equatorial MS waves, in addition to equatorial MS waves, can contribute importantly to the dynamical variations of radiation belt electron fluxes and their pitch angle distribution. |
英文关键词 | off-equatorial MS waves butterfly pitch angle distributions radiation belt electrons |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426161800004 |
WOS关键词 | TEST PARTICLE SIMULATIONS ; VAN ALLEN PROBES ; RELATIVISTIC ELECTRONS ; BUTTERFLY DISTRIBUTIONS ; PLASMASPHERIC HISS ; MAGNETOSPHERE ; NOISE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/26463 |
专题 | 气候变化 |
作者单位 | Wuhan Univ, Sch Elect Informat, Dept Space Phys, Wuhan, Hubei, Peoples R China |
推荐引用方式 GB/T 7714 | Ni, Binbin,Zou, Zhengyang,Fu, Song,et al. Resonant Scattering of Radiation Belt Electrons by Off-Equatorial Magnetosonic Waves[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(3):1228-1236. |
APA | Ni, Binbin,Zou, Zhengyang,Fu, Song,Cao, Xing,Gu, Xudong,&Xiang, Zheng.(2018).Resonant Scattering of Radiation Belt Electrons by Off-Equatorial Magnetosonic Waves.GEOPHYSICAL RESEARCH LETTERS,45(3),1228-1236. |
MLA | Ni, Binbin,et al."Resonant Scattering of Radiation Belt Electrons by Off-Equatorial Magnetosonic Waves".GEOPHYSICAL RESEARCH LETTERS 45.3(2018):1228-1236. |
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