DOI: 10.1002/2015GL064988
论文题名: Imprints of impulse-excited hydromagnetic waves on electrons in the Van Allen radiation belts
作者: Zhou X.-Z. ; Wang Z.-H. ; Zong Q.-G. ; Claudepierre S.G. ; Mann I.R. ; Kivelson M.G. ; Angelopoulos V. ; Hao Y.-X. ; Wang Y.-F. ; Pu Z.-Y.
刊名: Geophysical Research Letters
ISSN: 0094-8599
EISSN: 1944-8330
出版年: 2015
卷: 42, 期: 15 起始页码: 6199
结束页码: 6204
语种: 英语
英文关键词: drift resonance
; radiation belt
; ULF waves
; Van Allen Probes
; wave growth
; wave-particle interaction
Scopus关键词: Electrons
; Ionizing radiation
; Magnetohydrodynamics
; Magnetosphere
; Resonance
; Electromagnetic oscillations
; Electron acceleration
; Generation and growth
; Relativistic energy
; ULF waves
; Ultra low frequencies
; Van allen radiation belts
; Wave-particle interactions
; Radiation belts
; acceleration
; belt
; electromagnetic method
; electron
; magnetosphere
; standing wave
英文摘要: Ultralow frequency electromagnetic oscillations, interpreted as standing hydromagnetic waves in the magnetosphere, are a major energy source that accelerates electrons to relativistic energies in the Van Allen radiation belt. Electrons can rapidly gain energy from the waves when they resonate via a process called drift resonance, which is observationally characterized by energy-dependent phase differences between electron flux and electromagnetic oscillations. Such dependence has been recently observed and interpreted as spacecraft identifications of drift resonance electron acceleration. Here we show that in the initial wave cycles, the observed phase relationship differs from that characteristic of well-developed drift resonance. We further examine the differences and find that they are imprints of impulse-excited, coupled fast-Alfvén waves before they transform into more typical standing waves. Our identification of such imprints provides a new understanding of how energy couples in the inner magnetosphere, and a new diagnostic for the generation and growth of magnetospheric hydromagnetic pulsations. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940451169&doi=10.1002%2f2015GL064988&partnerID=40&md5=70b5f9b0fff606c632df0d5ec0e469e8
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8215
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Earth and Space Sciences, Peking University, Beijing, China
Recommended Citation:
Zhou X.-Z.,Wang Z.-H.,Zong Q.-G.,et al. Imprints of impulse-excited hydromagnetic waves on electrons in the Van Allen radiation belts[J]. Geophysical Research Letters,2015-01-01,42(15).