globalchange  > 气候减缓与适应
DOI: 10.1002/2017JA025114
Scopus记录号: 2-s2.0-85043681186
论文题名:
Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events
作者: Ma Q.; Li W.; Bortnik J.; Thorne R.M.; Chu X.; Ozeke L.G.; Reeves G.D.; Kletzing C.A.; Kurth W.S.; Hospodarsky G.B.; Engebretson M.J.; Spence H.E.; Baker D.N.; Blake J.B.; Fennell J.F.; Claudepierre S.G.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:3
起始页码: 1938
结束页码: 1952
语种: 英语
英文关键词: electron acceleration ; radial diffusion ; radiation belt simulation ; Van Allen Probes observation ; whistler mode waves
英文摘要: We simulate the radiation belt electron flux enhancements during selected Geospace Environment Modeling (GEM) challenge events to quantitatively compare the major processes involved in relativistic electron acceleration under different conditions. Van Allen Probes observed significant electron flux enhancement during both the storm time of 17–18 March 2013 and non–storm time of 19–20 September 2013, but the distributions of plasma waves and energetic electrons for the two events were dramatically different. During 17–18 March 2013, the SYM-H minimum reached −130 nT, intense chorus waves (peak Bw ~140 pT) occurred at 3.5 < L < 5.5, and several hundred keV to several MeV electron fluxes increased by ~2 orders of magnitude mostly at 3.5 < L < 5.5. During 19–20 September 2013, the SYM-H remained higher than −30 nT, modestly intense chorus waves (peak Bw ~80 pT) occurred at L > 5.5, and electron fluxes at energies up to 3 MeV increased by a factor of ~5 at L > 5.5. The two electron flux enhancement events were simulated using the available wave distribution and diffusion coefficients from the GEM focus group Quantitative Assessment of Radiation Belt Modeling. By comparing the individual roles of local electron heating and radial transport, our simulation indicates that resonant interaction with chorus waves is the dominant process that accounts for the electron flux enhancement during the storm time event particularly near the flux peak locations, while radial diffusion by ultralow-frequency waves plays a dominant role in the enhancement during the non–storm time event. Incorporation of both processes reasonably reproduces the observed location and magnitude of electron flux enhancement. ©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/114375
Appears in Collections:气候减缓与适应

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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Center for Space Physics, Boston University, Boston, MA, United States; Department of Physics, University of Alberta, Edmonton, AB, Canada; Space Science and Applications Group, Los Alamos National Laboratory, Los Alamos, NM, United States; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States; Department of Physics, Augsburg University, Minneapolis, MN, United States; Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States; Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, Boulder, CO, United States; The Aerospace Corporation, Los Angeles, CA, United States

Recommended Citation:
Ma Q.,Li W.,Bortnik J.,et al. Quantitative Evaluation of Radial Diffusion and Local Acceleration Processes During GEM Challenge Events[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(3)
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