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Cassini Observation of Relativistic Electron Butterfly Distributions in Saturn's Inner Radiation Belts: Evidence for Acceleration by Local Processes

文献类型：期刊论文

作者Yuan, C-J2,3,4,5; Roussos, E.6; Wei, Y.2,5; Krupp, N.6; Sun, Y. X.1; Hao, Y. X.1
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2021-07-28
卷号48期号:14页码:10
关键词radiation belt Saturn magnetosphere
ISSN号0094-8276
DOI10.1029/2021GL092690
英文摘要The morphology of electron pitch angle distributions (PADs) helps to identify dynamic processes in Saturn's magnetosphere. Previous studies demonstrated convective transport being important for relativistic electron acceleration at L > 4 in the inner magnetosphere, whereas closer to Saturn the situation is not as well established. We have investigated the PADs of relativistic electrons throughout radiation belts, using 13-years measurements from Cassini spacecraft. Our results show that at 3.5 < L < 6, the PADs peak near 90 degrees. However, at 2.5 < L < 3.5, the PADs transform to butterfly distributions, dominating over an energy range of one order of magnitude, from 800 keV to >7 MeV. These results suggest that convective transport continues to govern down to L = 3.5. For even smaller L-shells, the independence of butterfly PADs from energy suggests that the acceleration by resonant interactions of electrons with waves likely serves as an additional key mechanism regulating the dynamics in the core region of radiation belts.
WOS关键词PITCH-ANGLE DISTRIBUTIONS ; PROTONS ; RINGS
资助项目Strategic Priority Research Program of Chinese Academy of Sciences[XDA17010201] ; Key Research Program of the Institute of Geology & Geophysics, CAS[IGGCAS-201904] ; National Natural Science Foundation of China[42074200] ; National Natural Science Foundation of China[42030202] ; National Natural Science Foundation of China[41774161] ; Specialized Research Fund for State Key Laboratories ; German Space Agency (DLR)[50/OH/1101] ; German Space Agency (DLR)[50/OH/1502] ; Max Planck Society ; Projekt DEAL
WOS研究方向Geology
语种英语
WOS记录号WOS:000711496700004
出版者AMER GEOPHYSICAL UNION
资助机构Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; German Space Agency (DLR) ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Max Planck Society ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL ; Projekt DEAL
源URL[http://ir.iggcas.ac.cn/handle/132A11/103005]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Roussos, E.
作者单位1.Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Mohe Natl Observ Geol, Beijing, Peoples R China
4.Chinese Acad Sci, State Key Lab Space Weather, Beijing, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
6.Max Planck Inst Solar Syst Res, Gottingen, Germany
推荐引用方式
GB/T 7714		 Yuan, C-J,Roussos, E.,Wei, Y.,et al. Cassini Observation of Relativistic Electron Butterfly Distributions in Saturn's Inner Radiation Belts: Evidence for Acceleration by Local Processes[J]. GEOPHYSICAL RESEARCH LETTERS,2021,48(14):10.
APA Yuan, C-J,Roussos, E.,Wei, Y.,Krupp, N.,Sun, Y. X.,&Hao, Y. X..(2021).Cassini Observation of Relativistic Electron Butterfly Distributions in Saturn's Inner Radiation Belts: Evidence for Acceleration by Local Processes.GEOPHYSICAL RESEARCH LETTERS,48(14),10.
MLA Yuan, C-J,et al."Cassini Observation of Relativistic Electron Butterfly Distributions in Saturn's Inner Radiation Belts: Evidence for Acceleration by Local Processes".GEOPHYSICAL RESEARCH LETTERS 48.14(2021):10.

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来源：地质与地球物理研究所

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