DOI: 10.1002/2013GL058581
论文题名: Spatial localization and ducting of EMIC waves: Van Allen Probes and ground-based observations
作者: Mann I.R. ; Usanova M.E. ; Murphy K. ; Robertson M.T. ; Milling D.K. ; Kale A. ; Kletzing C. ; Wygant J. ; Thaller S. ; Raita T.
刊名: Geophysical Research Letters
ISSN: 0094-10393
EISSN: 1944-10124
出版年: 2014
卷: 41, 期: 3 起始页码: 785
结束页码: 792
语种: 英语
英文关键词: Ducting
; EMIC waves
; Ground observations
; MLT extent
; Spatial width
; Van Allen Probes
Scopus关键词: Geomagnetism
; Magnetometers
; Plasmas
; Polarization
; Radiation belts
; Ducting
; Ground based measurement
; Ground observations
; Ground-based observations
; Induction coil magnetometers
; MLT extent
; Solar-terrestrial environment
; Spatial width
; Probes
; electromagnetic radiation
; emission
; geomagnetic storm
; ionosphere
; measurement method
; numerical model
; observational method
; polarization
; spatial analysis
; Canada
英文摘要: On 11 October 2012, during the recovery phase of a moderate geomagnetic storm, an extended interval (> 18 h) of continuous electromagnetic ion cyclotron (EMIC) waves was observed by Canadian Array for Real-time Investigations of Magnetic Activity and Solar-Terrestrial Environment Program induction coil magnetometers in North America. At around 14:15 UT, both Van Allen Probes B and A (65° magnetic longitude apart) in conjunction with the ground array observed very narrow (ΔL ~ 0.1-0.4) left-hand polarized EMIC emission confined to regions of mass density gradients at the outer edge of the plasmasphere at L ~ 4. EMIC waves were seen with complex polarization patterns on the ground, in good agreement with model results from Woodroffe and Lysak (2012) and consistent with Earth's rotation sweeping magnetometer stations across multiple polarization reversals in the fields in the Earth-ionosphere duct. The narrow L-widths explain the relative rarity of space-based EMIC occurrence, ground-based measurements providing better estimates of global EMIC wave occurrence for input into radiation belt dynamical models. Key Points Continuous EMIC waves confined to narrow L-shells near plasma density gradients The narrow L-widths explains low in-situ EMIC occurrence Ground measurements provide better estimates of global EMIC wave occurrence ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893867732&doi=10.1002%2f2013GL058581&partnerID=40&md5=39fc28ce63fe0701daaec7b75d49d90e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7657
Appears in Collections: 气候减缓与适应
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作者单位: Department of Physics, University of Alberta, Edmonton, AB, Canada
Recommended Citation:
Mann I.R.,Usanova M.E.,Murphy K.,et al. Spatial localization and ducting of EMIC waves: Van Allen Probes and ground-based observations[J]. Geophysical Research Letters,2014-01-01,41(3).