Rapid flattening of butterfly pitch angle distributions of radiation belt electrons by whistler-mode chorus

被引：35

作者：

Yang, Chang ^{[1
,2
,3
]}

Su, Zhenpeng ^{[1
,2
]}

Xiao, Fuliang ^{[3
]}

Zheng, Huinan ^{[1
,2
]}

Wang, Yuming ^{[1
,2
]}

Wang, Shui ^{[1
,2
]}

Spence, H. E. ^{[4
]}

Reeves, G. D. ^{[5
,6
]}

Baker, D. N. ^{[7
]}

Blake, J. B. ^{[8
]}

Funsten, H. O. ^{[9
]}

机构：

[1] Univ Sci & Technol China, Dept Geophys & Planetary Sci, Hefei, Peoples R China

[2] Univ Sci & Technol China, Collaborat Innovat Ctr Astronaut Sci & Technol, Hefei, Peoples R China

[3] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha, Hunan, Peoples R China

[4] Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA

[5] Los Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USA

[6] New Mexico Consortium, Div Space Sci, Los Alamos, NM USA

[7] Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA

[8] Aerosp Corp, POB 92957, Los Angeles, CA 90009 USA

[9] Los Alamos Natl Lab, ISR Div, Los Alamos, NM USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 16期

基金：

中国国家自然科学基金;

关键词：

Radiation belt; wave; particle interactions; butterfly pitch-angle distribution; chorus waves; quasi-linear simulation; Van Allen Probes; ENERGY DIFFUSION-COEFFICIENTS; RELATIVISTIC ELECTRONS; GEOMAGNETIC STORMS; INNER MAGNETOSPHERE; MAGNETIC-FIELD; ION-CYCLOTRON; ACCELERATION; WAVES; FLUX; SCATTERING;

D O I：

10.1002/2016GL070194

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Van Allen radiation belt electrons exhibit complex dynamics during geomagnetically active periods. Investigation of electron pitch angle distributions (PADs) can provide important information on the dominant physical mechanisms controlling radiation belt behaviors. Here we report a storm time radiation belt event where energetic electron PADs changed from butterfly distributions to normal or flattop distributions within several hours. Van Allen Probes observations showed that the flattening of butterfly PADs was closely related to the occurrence of whistler-mode chorus waves. Two-dimensional quasi-linear STEERB simulations demonstrate that the observed chorus can resonantly accelerate the near-equatorially trapped electrons and rapidly flatten the corresponding electron butterfly PADs. These results provide a new insight on how chorus waves affect the dynamic evolution of radiation belt electrons.

引用

页码：8339 / 8347

页数：9

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