气候变化领域集成服务门户(CCPortal): Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Comparison With Theory

CCPortal

DOI	10.1029/2019GL086056
	Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Comparison With Theory
	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 compute quasilinear diffusion rates due to pitch angle scattering by various mechanisms in the Earth's electron radiation belts. The calculated theoretical lifetimes are compared with observed decay rates, and we find excellent qualitative agreement between the two. The overall structure of the observed lifetime profiles as a function of energy and L is largely due to plasmaspheric hiss and Coulomb scattering. The results also reveal a local minimum in lifetimes in the inner zone at lower energy (̃ 50 keV), attributed to enhanced scattering via ground-based very low frequency transmitters, and a reduction in lifetimes at higher L and energy (> 1 MeV), attributed to enhanced electromagnetic ion cyclotron wave scattering. In addition, we find significant quantitative disagreement at L < 3.5, where the theoretical lifetimes are typically a factor of ̃ 10 larger than the observed, pointing to an additional loss process that is missing from current models. We discuss potential factors that could contribute to this disagreement. ©2020. The Authors.
英文关键词	Cyclotron radiation; Electron beams; Losses; Radiation belts; decay; Earth's radiation belts; Electron radiation belt; lifetime; Pitch angle; Pitch-angle scattering; Quasilinear diffusion; Wave-particle interactions; Atmospherics; Coulomb criterion; electromagnetic field; electron density; empirical analysis; geoelectric field; ion; quantitative analysis; radiation exposure
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/170804
作者单位	Space Sciences Department, The Aerospace Corporation, El Segundo, CA, United States; Department of Atmospheric and Oceanic Sciences, UCLA, 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: Comparison With Theory[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: Comparison With Theory.Geophysical Research Letters,47(3).
MLA	Claudepierre S.G.,et al."Empirically Estimated Electron Lifetimes in the Earth's Radiation Belts: Comparison With Theory".Geophysical Research Letters 47.3(2020).