DOI: 10.1002/2014GL059565
论文题名: Applying bicoherence analysis to spacecraft observations of Langmuir waves
作者: Graham D.B. ; Malaspina D.M. ; Cairns I.H.
刊名: Geophysical Research Letters
ISSN: 0094-10303
EISSN: 1944-10034
出版年: 2014
卷: 41, 期: 5 起始页码: 1367
结束页码: 1374
语种: 英语
英文关键词: harmonic waves
; Langmuir waves
; sheath rectification
; spectral analysis
Scopus关键词: Electrostatics
; Radio astronomy
; Shear waves
; Spacecraft
; Spectrum analysis
; Waves
; Bicoherence analysis
; Harmonic field
; Harmonic wave
; Langmuir waves
; Nonlinear current
; sheath rectification
; Solar radio bursts
; Transverse waves
; Decay (organic)
; coalescence
; harmonic analysis
; radio wave
; spacecraft
; spectral analysis
; wave generation
; wave modeling
英文摘要: In type II and type III solar radio bursts and planetary foreshocks, the processes which convert Langmuir waves (LWs) to transverse waves are not well understood. One of the proposed mechanisms for generating transverse waves involves electrostatic (ES) decay followed by coalescence of two LWs. One of the tests used to identify this process is bicoherence analysis. Bicoherence has been applied to spacecraft observations of LWs to yield results consistent with ES decay and coalescence. However, recent work has shown that the harmonic fields produced by LWs are more consistent with sheath rectification and nonlinear currents. It is shown here that sheath rectification and nonlinear currents yield bicoherences similar to those expected for ES decay and coalescence, explaining the bicoherences associated with spacecraft observations of LWs. These results show that bicoherence alone cannot be used to identify ES decay and coalescence and emphasize the importance of sheath rectification. Key Points Sheath rectification and nonlinear currents produce phase-coherent fields Bicoherences are consistent with nonlinear currents and sheath rectification Bicoherence cannot identify electrostatic decay and coalescence ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895125420&doi=10.1002%2f2014GL059565&partnerID=40&md5=dadfe0ac955ce8a92208d6bfec098e70
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7567
Appears in Collections: 气候减缓与适应
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作者单位: Swedish Institute of Space Physics, Uppsala, Sweden
Recommended Citation:
Graham D.B.,Malaspina D.M.,Cairns I.H.. Applying bicoherence analysis to spacecraft observations of Langmuir waves[J]. Geophysical Research Letters,2014-01-01,41(5).