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题名: Spectral properties and associated plasma energization by magnetosonic waves in the Earth's magnetosphere: Particle-in-cell simulations
作者: Sun, Jicheng; Gao, Xinliang; Lu, Quanming; Chen, Lunjin; Liu, Xu; Wang, Xueyi; Tao, Xin; Wang, Shui
作者部门: 空间科学部
通讯作者: Gao, XL (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei, Peoples R China. ; Gao, XL (reprint author), Collaborat Innovat Ctr Astronaut Sci & Technol, Harbin, Peoples R China. ; Gao, XL (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Beijing, Peoples R China.
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN号: 2169-9380
出版日期: 2017
卷号: 122, 期号:5, 页码:5377-5390
收录类别: SCI
项目资助者: NSFC (National Natural Science Foundation of China) [41474125, 41331067, 41527804, 11235009, 41474142] ; Fundamental Research Funds for the Central Universities ; Specialized Research Fund for State Key Laboratories ; Youth Innovation Promotion Association of Chinese Academy of Sciences [2016395] ; NSF (National Science Foundation) [AGS-1405041]
英文摘要: In this paper, we perform a 1-D particle-in-cell (PIC) simulation model consisting of three species, cold electrons, cold ions, and energetic ion ring, to investigate spectral structures of magnetosonic waves excited by ring distribution protons in the Earth's magnetosphere, and dynamics of charged particles during the excitation of magnetosonic waves. As the wave normal angle decreases, the spectral range of excited magnetosonic waves becomes broader with upper frequency limit extending beyond the lower hybrid resonant frequency, and the discrete spectra tends to merge into a continuous one. This dependence on wave normal angle is consistent with the linear theory. The effects of magnetosonic waves on the background cold plasma populations also vary with wave normal angle. For exactly perpendicular magnetosonic waves (parallel wave number k(parallel to) = 0), there is no energization in the parallel direction for both background cold protons and electrons due to the negligible fluctuating electric field component in the parallel direction. In contrast, the perpendicular energization of background plasmas is rather significant, where cold protons follow unmagnetized motion while cold electrons follow drift motion due to wave electric fields. For magnetosonic waves with a finite k(parallel to), there exists a nonnegligible parallel fluctuating electric field, leading to a significant and rapid energization in the parallel direction for cold electrons. These cold electrons can also be efficiently energized in the perpendicular direction due to the interaction with the magnetosonic wave fields in the perpendicular direction. However, cold protons can be only heated in the perpendicular direction, which is likely caused by the higher-order resonances with magnetosonic waves. The potential impacts of magnetosonic waves on the energization of the background cold plasmas in the Earth's inner magnetosphere are also discussed in this paper.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.nssc.ac.cn/handle/122/6018
Appears in Collections:空间科学部_期刊论文

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