气候变化领域集成服务门户(CCPortal): Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations

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DOI	10.1029/2019GL086053
	Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations
	Claudepierre S.G.; Ma Q.; Bortnik J.; O'Brien T.P.; Fennell J.F.; Blake J.B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	We use measurements from NASA's Van Allen Probes to calculate the decay time constants for electrons over a wide range of energies (30 keV to 4 MeV) and L values (L = 1.3–6.0) in the Earth's radiation belts. Using an automated routine to identify flux decay events, we construct a large database of lifetimes for near-equatorially mirroring electrons over a 5-year interval. We provide the first accurate estimates of the long decay timescales in the inner zone (~ 100 days), which are highly resolved in energy and free from proton contamination. In the slot region and outer zone, we compare our lifetime calculations with prior empirical estimates and find good quantitative agreement (lifetimes ~ 1–20 days). The comparisons suggest that some prior estimates may overestimate electron lifetimes between L ≈ 2.5–4.5 due to instrumental effects and/or background contamination. Previously reported two-stage decays are explicitly demonstrated to be a consequence of using integral fluxes. ©2020. The Authors.
英文关键词	Losses; NASA; Probes; Radiation belts; decay; Decay time constant; Earth's radiation belts; lifetime; Lifetime calculation; Pitch angle; Quantitative agreement; Wave-particle interactions; Electrons; accuracy assessment; automation; database; electron; empirical analysis; estimation method; observational method; probe; quantitative analysis; radiation balance; wave property
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170784
作者单位	Space Sciences Department, The Aerospace Corporation, El Segundo, CA, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Center for Space Physics, Boston University, Boston, MA, United States
推荐引用方式 GB/T 7714	Claudepierre S.G.,Ma Q.,Bortnik J.,et al. Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations[J],2020,47(3).
APA	Claudepierre S.G.,Ma Q.,Bortnik J.,O'Brien T.P.,Fennell J.F.,&Blake J.B..(2020).Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations.Geophysical Research Letters,47(3).
MLA	Claudepierre S.G.,et al."Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Van Allen Probe Observations".Geophysical Research Letters 47.3(2020).