globalchange  > 科学计划与规划
DOI: 10.1002/2016GL071158
论文题名:
Statistical distribution of EMIC wave spectra: Observations from Van Allen Probes
作者: Zhang X.-J.; Li W.; Thorne R.M.; Angelopoulos V.; Bortnik J.; Kletzing C.A.; Kurth W.S.; Hospodarsky G.B.
刊名: Geophysical Research Letters
ISSN: 0094-8300
EISSN: 1944-8031
出版年: 2016
卷: 43, 期:24
起始页码: 12348
结束页码: 12355
语种: 英语
英文关键词: EMIC waves ; magnetic storm ; outer radiation belt ; relativistic electron loss ; Van Allen Probes ; wave-particle interaction
Scopus关键词: Cyclotrons ; Electrons ; Geomagnetism ; Radiation belts ; Radiation effects ; Spectroscopy ; Wave power ; Electron gyrofrequency ; Magnetic storms ; Outer radiation belt ; Overall effectiveness ; Radiation belt model ; Relativistic electron ; Statistical distribution ; Wave-particle interactions ; Probes
英文摘要: It has been known that electromagnetic ion cyclotron (EMIC) waves can precipitate ultrarelativistic electrons through cyclotron resonant scattering. However, the overall effectiveness of this mechanism has yet to be quantified, because it is difficult to obtain the global distribution of EMIC waves that usually exhibit limited spatial presence. We construct a statistical distribution of EMIC wave frequency spectra and their intensities based on Van Allen Probes measurements from September 2012 to December 2015. Our results show that as the ratio of plasma frequency over electron gyrofrequency increases, EMIC wave power becomes progressively dominated by the helium band. There is a pronounced dawn-dusk asymmetry in the wave amplitude and the frequency spectrum. The frequency spectrum does not follow the commonly used single-peak Gaussian function. Incorporating these realistic EMIC wave frequency spectra into radiation belt models is expected to improve the quantification of EMIC wave scattering effects in ultrarelativistic electron dynamics. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85007480386&doi=10.1002%2f2016GL071158&partnerID=40&md5=5500eaa4aed739abed1f295e6859629f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9263
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, UCLA, Los Angeles, CA, United States

Recommended Citation:
Zhang X.-J.,Li W.,Thorne R.M.,et al. Statistical distribution of EMIC wave spectra: Observations from Van Allen Probes[J]. Geophysical Research Letters,2016-01-01,43(24).
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