DOI: 10.1002/2015GL065565
论文题名: Van Allen Probes observations of unusually low frequency whistler mode waves observed in association with moderate magnetic storms: Statistical study
作者: Cattell C.A. ; Breneman A.W. ; Thaller S.A. ; Wygant J.R. ; Kletzing C.A.
刊名: Geophysical Research Letters
ISSN: 0094-9539
EISSN: 1944-9270
出版年: 2015
卷: 42, 期: 18 起始页码: 7273
结束页码: 7281
语种: 英语
英文关键词: chorus
; outer radiation belt
Scopus关键词: Cyclotrons
; Geomagnetism
; Probes
; Radiation belts
; Statistics
; Storms
; Chorus
; Electron cyclotron frequency
; Energetic electron
; Geomagnetic storm
; Outer radiation belt
; Statistical study
; Very low frequency
; Whistler-mode waves
; Atmospherics
; amplitude
; belt
; electron
; frequency analysis
; geomagnetic storm
; magnetic property
; observational method
; satellite imagery
; statistical analysis
英文摘要: We show the first evidence for locally excited chorus at frequencies below 0.1 fce (electron cyclotron frequency) in the outer radiation belt. A statistical study of chorus during geomagnetic storms observed by the Van Allen Probes found that frequencies are often dramatically lower than expected. The frequency at peak power suddenly stops tracking the equatorial 0.5 fce and f/fce decreases rapidly, often to frequencies well below 0.1 fce (in situ and mapped to equator). These very low frequency waves are observed both when the satellites are close to the equatorial plane and at higher magnetic latitudes. Poynting flux is consistent with generation at the equator. Wave amplitudes can be up to 20 to 40 mV/m and 2 to 4 nT. We conclude that conditions during moderate to large storms can excite unusually low frequency chorus, which is resonant with more energetic electrons than typical chorus, with critical implications for understanding radiation belt evolution. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945436311&doi=10.1002%2f2015GL065565&partnerID=40&md5=06adae6f404bae23d17f93c6dba4c00a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9154
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 Physics and Astronomy, University of Minnesota, Twin Cities, Minneapolis, MN, United States
Recommended Citation:
Cattell C.A.,Breneman A.W.,Thaller S.A.,et al. Van Allen Probes observations of unusually low frequency whistler mode waves observed in association with moderate magnetic storms: Statistical study[J]. Geophysical Research Letters,2015-01-01,42(18).