globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA025142
Scopus记录号: 2-s2.0-85050315632
论文题名:
Rapid Enhancements of the Seed Populations in the Heart of the Earth's Outer Radiation Belt: A Multicase Study
作者: Tang C.L.; Xie X.J.; Ni B.; Su Z.P.; Reeves G.D.; Zhang J.-C.; Baker D.N.; Spence H.E.; Funsten H.O.; Blake J.B.; Wygant J.R.; Dai G.Y.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:6
起始页码: 4895
结束页码: 4907
语种: 英语
英文关键词: enhanced convection ; substorm injections ; the outer radiation belt ; the seed population ; ULF waves
英文摘要: To better understand rapid enhancements of the seed populations (hundreds of keV electrons) in the heart of the Earth's outer radiation belt (L* ~ 3.5–5.0) during different geomagnetic activities, we investigate three enhancement events measured by Van Allen Probes in detail. Observations of the fluxes and the pitch angle distributions of energetic electrons are analyzed to determine rapid enhancements of the seed populations. Our study shows that three specified processes associated with substorm electron injections can lead to rapid enhancements of the seed populations, and the electron energy increases up to 342 keV. In the first process, substorm electron injections accompanied by the transient and intense substorm electric fields can directly lead to rapid enhancements of the seed populations in the heart of the outer radiation belt. In the second process, the substorm injected electrons are first trapped in the outer radiation belt and subsequently transported into L* < 4.5 by the convection electric field. In the third process, the lower energy electrons are first injected at L* ~ 5.3 and then undergo drift resonance with ultralow-frequency waves. These accelerated electrons by ultralow-frequency waves are further transported into L* < 4.5 due to the convection electric field. This process is consistent with the radial diffusion. Our results suggest that these specified processes are important for understanding the dynamics of the seed populations in the heart of the outer radiation belt. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113813
Appears in Collections:气候减缓与适应

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作者单位: Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China; Sate Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing, China; School of Space Science and Physics, Shandong University, Weihai, China; Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan, China; CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Sciences, University of Science and Technology of China, Hefei, China; Los Alamos National Laboratory, ISR Division, Los Alamos, NM, United States; Space Science Center and Department of Physics, University of New Hampshire, Durham, NH, United States; Laboratory for Atmospheric and Space Research, University of Colorado Boulder, Boulder, CO, United States; The Aerospace Corporation, Los Angeles, CA, United States; School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, United States

Recommended Citation:
Tang C.L.,Xie X.J.,Ni B.,et al. Rapid Enhancements of the Seed Populations in the Heart of the Earth's Outer Radiation Belt: A Multicase Study[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(6)
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