Time Scales for Electron Quasi-linear Diffusion by Lower-Band Chorus Waves: The Effects of omega(pe)/Omega(ce) Dependence on Geomagnetic Activity

doi:10.1029/2019GL083446

GSTDTAP > 气候变化

DOI	10.1029/2019GL083446
	Time Scales for Electron Quasi-linear Diffusion by Lower-Band Chorus Waves: The Effects of omega(pe)/Omega(ce) Dependence on Geomagnetic Activity
	Agapitov, O.1,2; Mourenas, D.3; Artemyev, A.4; Hospodarsky, G.5; Bonnell, J. W.1
	2019-06-28
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2019
卷号	46 期号:12 页码:6178-6187
文章类型	Article
语种	英语
国家	USA; Ukraine; France
英文摘要	Electron scattering by chorus waves is an important mechanism that can lead to fast electron acceleration and loss in the outer radiation belt. Making use of Van Allen Probes measurements, we present the first statistical survey of megaelectron volt electron pitch angle and energy quasi-linear diffusion rates by chorus waves as a function of L-shell, local time, and AE index, taking into account the local electron plasma frequency to gyrofrequency ratio omega(pe)/Omega(ce), chorus wave frequency, and resonance wave amplitude. We demonstrate that during disturbed periods, omega(pe)/Omega(ce) strongly decreases in the night sector, leading to a faster electron loss but also a much faster electron energization in two distinct regions just above the plasmapause and at L similar to 3.5-5.5. Spatiotemporal variations of omega(pe)/Omega(ce) with AE shape the evolution of electron energization in the outer belt, sometimes leading to very short time scales for quasi-linear megaelectron volt electron acceleration in agreement with Van Allen Probes observations.
英文关键词	wave-particle interactions quasi-linear scattering and acceleration magnetosphere plasma density
领域	气候变化
收录类别	SCI-E
WOS记录号	WOS:000477616300003
WOS关键词	RADIATION-BELT ELECTRONS ; VAN ALLEN PROBES ; RELATIVISTIC ELECTRONS ; ACCELERATION ; MODEL ; ENHANCEMENTS ; DYNAMICS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/184202
专题	气候变化
作者单位	1.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA; 2.Natl Taras Shevchenko Univ Kyiv, Astron & Space Phys Dept, Kiev, Ukraine; 3.CEA, DAM, DIF, Arpajon, France; 4.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA; 5.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
推荐引用方式 GB/T 7714	Agapitov, O.,Mourenas, D.,Artemyev, A.,et al. Time Scales for Electron Quasi-linear Diffusion by Lower-Band Chorus Waves: The Effects of omega(pe)/Omega(ce) Dependence on Geomagnetic Activity[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(12):6178-6187.
APA	Agapitov, O.,Mourenas, D.,Artemyev, A.,Hospodarsky, G.,&Bonnell, J. W..(2019).Time Scales for Electron Quasi-linear Diffusion by Lower-Band Chorus Waves: The Effects of omega(pe)/Omega(ce) Dependence on Geomagnetic Activity.GEOPHYSICAL RESEARCH LETTERS,46(12),6178-6187.
MLA	Agapitov, O.,et al."Time Scales for Electron Quasi-linear Diffusion by Lower-Band Chorus Waves: The Effects of omega(pe)/Omega(ce) Dependence on Geomagnetic Activity".GEOPHYSICAL RESEARCH LETTERS 46.12(2019):6178-6187.