DOI: 10.1002/2016GL068780
论文题名: New chorus wave properties near the equator from Van Allen Probes wave observations
作者: Li W. ; Santolik O. ; Bortnik J. ; Thorne R.M. ; Kletzing C.A. ; Kurth W.S. ; Hospodarsky G.B.
刊名: Geophysical Research Letters
ISSN: 0094-9715
EISSN: 1944-9446
出版年: 2016
卷: 43, 期: 10 起始页码: 4725
结束页码: 4735
语种: 英语
英文关键词: chorus wave
; oblique
; quasi-electrostatic
; quasi-parallel
; wave normal angles
Scopus关键词: Electromagnetic waves
; Electrostatics
; Geomagnetism
; Magnetosphere
; Probes
; Chorus waves
; Electric intensity
; Energetic electron
; Frequency spectra
; Geomagnetic activities
; Magnetic intensities
; Oblique
; Quasi-parallel
; Atmospherics
; electromagnetic wave
; electron density
; frequency analysis
; geomagnetism
; magnetic intensity
; probe
; resonance
; wave field
英文摘要: The chorus wave properties are evaluated using Van Allen Probes data in the Earth's equatorial magnetosphere. Two distinct modes of lower band chorus are identified: a quasi-parallel mode and a quasi-electrostatic mode, whose wave normal direction is close to the resonance cone. Statistical results indicate that the quasi-electrostatic (quasi-parallel) mode preferentially occurs during relatively quiet (disturbed) geomagnetic activity at lower (higher) L shells. Although the magnetic intensity of the quasi-electrostatic mode is considerably weaker than the quasi-parallel mode, their electric intensities are comparable. A newly identified feature of the quasi-electrostatic mode is that its frequency peaks at higher values compared to the quasi-parallel mode that exhibits a broad frequency spectrum. Moreover, upper band chorus wave normal directions vary between 0° and the resonance cone and become more parallel as geomagnetic activity increases. Our new findings suggest that chorus-driven energetic electron dynamics needs a careful examination by considering the properties of these two distinct modes. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84969962450&doi=10.1002%2f2016GL068780&partnerID=40&md5=40e1b8d39ce37d66a48c4b3a19eaf765
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10678
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: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States
Recommended Citation:
Li W.,Santolik O.,Bortnik J.,et al. New chorus wave properties near the equator from Van Allen Probes wave observations[J]. Geophysical Research Letters,2016-01-01,43(10).