气候变化领域集成服务门户(CCPortal): Lifetimes of Relativistic Electrons as Determined From Plasmaspheric Hiss Scattering Rates Statistics: Effects of ωpe/Ωce and Wave Frequency Dependence on Geomagnetic Activity

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DOI	10.1029/2020GL088052
	Lifetimes of Relativistic Electrons as Determined From Plasmaspheric Hiss Scattering Rates Statistics: Effects of ωpe/Ωce and Wave Frequency Dependence on Geomagnetic Activity
	Agapitov O.; Mourenas D.; Artemyev A.; Claudepierre S.G.; Hospodarsky G.; Bonnell J.W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:13
英文摘要	Whistler-mode hiss waves generally determine MeV electron lifetimes inside the plasmasphere. We use Van Allen Probes measurements to provide the first comprehensive statistical survey of plasmaspheric hiss-driven quasi-linear pitch-angle diffusion rates and lifetimes of MeV electrons as a function of L*, local time, and AE index, taking into account hiss power, electron plasma frequency to gyrofrequency ratio ωpe/Ωce, hiss frequency at peak power ωm, and cross correlations of these parameters. We find that during geomagnetically active periods with hiss observations, ωpe/Ωce and ωm decrease, leading to faster electron loss. We demonstrate that spatiotemporal variations of ωm and ωpe/Ωce with AE, together with wave power changes, significantly affect MeV electron loss, potentially leading to short lifetimes of less than 1 day. A parametric model of MeV electron lifetime driven by AE for L > 2.5 up to the plasmapause is developed and validated using Magnetic Electron Ion Spectrometer (MagEIS) electron flux decay database. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electrons; Geomagnetism; Magnetosphere; Wave power; Cross correlations; Electron plasma frequency; Geomagnetic activities; Magnetic electrons; Parametric modeling; Relativistic electron; Spatio-temporal variation; Statistical survey; Atmospherics; correlation; diffusion; electron; geomagnetic storm; measurement method; parameterization; plasma; spatiotemporal analysis; statistical analysis; wave power
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/170194
作者单位	Space Sciences Laboratory, University of California, Berkeley, CA, United States; Astronomy and Space Physics Department, National Taras Shevchenko University of Kyiv, Kyiv, Ukraine; CEA, DAM, DIF, Arpajon, France; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Space Sciences Department, The Aerospace Corporation, El Segundo, CA, United States; Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
推荐引用方式 GB/T 7714	Agapitov O.,Mourenas D.,Artemyev A.,et al. Lifetimes of Relativistic Electrons as Determined From Plasmaspheric Hiss Scattering Rates Statistics: Effects of ωpe/Ωce and Wave Frequency Dependence on Geomagnetic Activity[J],2020,47(13).
APA	Agapitov O.,Mourenas D.,Artemyev A.,Claudepierre S.G.,Hospodarsky G.,&Bonnell J.W..(2020).Lifetimes of Relativistic Electrons as Determined From Plasmaspheric Hiss Scattering Rates Statistics: Effects of ωpe/Ωce and Wave Frequency Dependence on Geomagnetic Activity.Geophysical Research Letters,47(13).
MLA	Agapitov O.,et al."Lifetimes of Relativistic Electrons as Determined From Plasmaspheric Hiss Scattering Rates Statistics: Effects of ωpe/Ωce and Wave Frequency Dependence on Geomagnetic Activity".Geophysical Research Letters 47.13(2020).