DOI: 10.1002/2016GL068313
论文题名: Generation of multiband chorus by lower band cascade in the Earth's magnetosphere
作者: Gao X. ; Lu Q. ; Bortnik J. ; Li W. ; Chen L. ; Wang S.
刊名: Geophysical Research Letters
ISSN: 0094-9228
EISSN: 1944-8959
出版年: 2016
卷: 43, 期: 6 起始页码: 2343
结束页码: 2350
语种: 英语
英文关键词: chorus waves
; harmonics
; lower band cascade
; THEMIS observation
; upper band generation
; wave-wave coupling
Scopus关键词: Electromagnetic waves
; Frequency bands
; Magnetosphere
; Chorus waves
; harmonics
; THEMIS observation
; upper band generation
; Wave coupling
; Atmospherics
; electromagnetic wave
; frequency analysis
; geomagnetic storm
; harmonic analysis
; magnetosphere
; observational method
; wave field
; wave-wave interaction
英文摘要: Chorus waves are intense electromagnetic whistler mode emissions in the magnetosphere, typically falling into two distinct frequency bands: a lower band (0.1-0.5fce) and an upper band (0.5-0.8fce) with a power gap at about 0.5fce. In this letter, with the Time History of Events and Macroscale Interactions during Substorms satellite, we observed two special chorus events, which are called as multiband chorus because upper band chorus is located at harmonics of lower band chorus. We propose a new potential generation mechanism for multiband chorus, which is called as lower band cascade. In this scenario, a density mode with a frequency equal to that of lower band chorus is generated by the ponderomotive effect (inhomogeneity of the electric amplitude) along the wave vector, and then upper band chorus with the frequency twice that of lower band chorus is generated through wave-wave couplings between lower band chorus and the density mode. The mechanism provides a new insight into the evolution of whistler mode chorus in the Earth's magnetosphere. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964688016&doi=10.1002%2f2016GL068313&partnerID=40&md5=3223bce1c5409b037765de5ad155bae5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10191
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: CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science, University of Science and Technology of China, Hefei, China
Recommended Citation:
Gao X.,Lu Q.,Bortnik J.,et al. Generation of multiband chorus by lower band cascade in the Earth's magnetosphere[J]. Geophysical Research Letters,2016-01-01,43(6).