globalchange  > 气候减缓与适应
DOI: 10.1029/2017JA025002
Scopus记录号: 2-s2.0-85048894731
论文题名:
A Distributed Lag Autoregressive Model of Geostationary Relativistic Electron Fluxes: Comparing the Influences of Waves, Seed and Source Electrons, and Solar Wind Inputs
作者: Simms L.; Engebretson M.; Clilverd M.; Rodger C.; Lessard M.; Gjerloev J.; Reeves G.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期:5
起始页码: 3646
结束页码: 3671
语种: 英语
英文关键词: EMIC waves ; empirical modeling of relativistic electrons ; multiple regression ; substorms ; ULF Pc5 waves ; VLF chorus waves
英文摘要: Relativistic electron flux at geosynchronous orbit depends on enhancement and loss processes driven by ultralow frequency (ULF) Pc5, chorus, and electromagnetic ion cyclotron (EMIC) waves, seed electron flux, magnetosphere compression, the “Dst effect,” and substorms, while solar wind inputs such as velocity, number density, and interplanetary magnetic field Bz drive these factors and thus correlate with flux. Distributed lag regression models show the time delay of highest influence of these factors on log10 high-energy electron flux (0.7–7.8 MeV, Los Alamos National Laboratory satellites). Multiple regression with an autoregressive term (flux persistence) allows direct comparison of the magnitude of each effect while controlling other correlated parameters. Flux enhancements due to ULF Pc5 and chorus waves are of equal importance. The direct effect of substorms on high-energy electron flux is strong, possibly due to injection of high-energy electrons by the substorms themselves. Loss due to electromagnetic ion cyclotron waves is less influential. Southward Bz shows only moderate influence when correlated processes are accounted for. Adding covariate compression effects (pressure and interplanetary magnetic field magnitude) allows wave-driven enhancements to be more clearly seen. Seed electrons (270 keV) are most influential at lower relativistic energies, showing that such a population must be available for acceleration. However, they are not accelerated directly to the highest energies. Source electrons (31.7 keV) show no direct influence when other factors are controlled. Their action appears to be indirect via the chorus waves they generate. Determination of specific effects of each parameter when studied in combination will be more helpful in furthering modeling work than studying them individually. ©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/113968
Appears in Collections:气候减缓与适应

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作者单位: Department of Physics, Augsburg University, Minneapolis, MN, United States; British Antarctic Survey, NERC, Cambridge, United Kingdom; Department of Physics, University of Otago, Dunedin, New Zealand; Department of Physics and Space Science Center (EOS), University of New Hampshire, Durham, NH, United States; Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD, United States; Los Alamos National Laboratory, Los Alamos, NM, United States

Recommended Citation:
Simms L.,Engebretson M.,Clilverd M.,et al. A Distributed Lag Autoregressive Model of Geostationary Relativistic Electron Fluxes: Comparing the Influences of Waves, Seed and Source Electrons, and Solar Wind Inputs[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)
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