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  2. 地质与地球物理研究所
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  4. 中国科学院地球与行星物理重点实验室
Acceleration of Ring Current Protons Driven by Magnetosonic Waves: Comparisons of Test Particle Simulations with Quasilinear Calculations

文献类型：期刊论文

作者Fu, Song4; Ge, Yasong1,2,3
刊名ASTROPHYSICAL JOURNAL
出版日期2021-02-01
卷号908期号:2页码:11
ISSN号0004-637X
关键词Van Allen radiation belt Planetary magnetosphere Space plasmas
DOI10.3847/1538-4357/abd2b3
英文摘要Wave-particle interactions play important roles in local acceleration and pitch angle scattering loss of charged particle dynamics in astrophysics and space physics, and energy transfer between plasma waves and particles is a key problem in plasma physics. Using full relativistic test particle simulations, we quantitatively evaluate the magnetosonic wave-driven acceleration of Earth's ring current protons both inside and outside the plasmapause at L = 4.5. Analysis of resonance conditions indicates that the broadband magnetosonic waves can affect protons by multiple harmonic cyclotron resonances. With a representative amplitude similar to 200 pT, magnetosonic waves can produce energy diffusion coefficients, obtained from test particle simulations, at rates of similar to 10(-4) s(-1) for protons similar to 1-3 keV inside the plasmapause and similar to 3-30 keV outside the plasmapause, both at equatorial pitch angles similar to 75 degrees-90 degrees. Compared with the quasilinear theory calculations, the test particle diffusion coefficients exhibit a difference due to the nonresonant transit time effect outside the plasmapause. Subsequent 2D Fokker-Planck simulations indicate that on a timescale of similar to 2 days, magnetosonic waves can effectively enhance the phase space density of the ring current protons similar to 10 keV inside the plasmapause and similar to 100 keV outside the plasmapause at equatorial pitch angles similar to 60 degrees-90 degrees, thereby leading to the evolvement of the ring current proton distribution from a Kappa-type to a 90 degrees-peaked profile. Our results demonstrate that the local acceleration of the ring current protons by magnetosonic waves is an important process of energy transfer between different populations of magnetospheric protons and hence contributes to the dynamic evolution of Earth's ring current.
资助项目National Key Research and Development Program of China[2016YFB0501304] ; National Key Research and Development Program of China[2016YFB0501300] ; NSFC[41704162] ; NSFC[41774176] ; NSFC[41974186] ; Chinese Academy of Sciences[XDB 41000000] ; pre-research projects on Civil Aerospace Technologies - China National Space Administration[D020303] ; pre-research projects on Civil Aerospace Technologies - China National Space Administration[D020308] ; pre-research projects on Civil Aerospace Technologies - China National Space Administration[D020103] ; pre-research projects on Civil Aerospace Technologies - China National Space Administration[D020104] ; National Key R&D Program of China[2018YFC1407303] ; China Postdoctoral Science Foundation[2018T110792] ; China Postdoctoral Science Foundation[2018M632908]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000621506900001
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; National Key R&D Program of China ; National Key R&D Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; National Key R&D Program of China ; National Key R&D Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; National Key R&D Program of China ; National Key R&D Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; NSFC ; NSFC ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; pre-research projects on Civil Aerospace Technologies - China National Space Administration ; National Key R&D Program of China ; National Key R&D Program of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/98776]  
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Ge, Yasong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
4.Wuhan Univ, Sch Elect Informat, Dept Space Phys, Wuhan, Peoples R China
推荐引用方式
GB/T 7714		 Fu, Song,Ge, Yasong. Acceleration of Ring Current Protons Driven by Magnetosonic Waves: Comparisons of Test Particle Simulations with Quasilinear Calculations[J]. ASTROPHYSICAL JOURNAL,2021,908(2):11.
APA Fu, Song,&Ge, Yasong.(2021).Acceleration of Ring Current Protons Driven by Magnetosonic Waves: Comparisons of Test Particle Simulations with Quasilinear Calculations.ASTROPHYSICAL JOURNAL,908(2),11.
MLA Fu, Song,et al."Acceleration of Ring Current Protons Driven by Magnetosonic Waves: Comparisons of Test Particle Simulations with Quasilinear Calculations".ASTROPHYSICAL JOURNAL 908.2(2021):11.

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来源：地质与地球物理研究所

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