DOI: 10.1002/2017JD027624
Scopus记录号: 2-s2.0-85040177688
论文题名: Spectral Characteristics of VLF Sferics Associated With RHESSI TGFs
作者: Mezentsev A. ; Lehtinen N. ; Østgaard N. ; Pérez-Invernón F.J. ; Cummer S.A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 1 起始页码: 139
结束页码: 159
语种: 英语
英文关键词: Earth-ionosphere waveguide
; EIWG propagation
; IC leader
; terrestrial gamma ray flash
; TGF radio emissions
; VLF sferics
Scopus关键词: electron
; frequency analysis
; gamma radiation
; instrumentation
; ionosphere
; lightning
; radio wave
; spectral analysis
英文摘要: We compared the modeled energy spectral density of very low frequency (VLF) radio emissions from terrestrial gamma ray flashes (TGFs) with the energy spectral density of VLF radio sferics recorded by Duke VLF receiver simultaneously with those TGFs. In total, six events with world wide lightning location network (WWLLN) defined locations were analyzed to exhibit a good fit between the modeled and observed energy spectral densities. In VLF range the energy spectral density of the TGF source current moment is found to be dominated by the contribution of secondary low-energy electrons and independent of the relativistic electrons which play their role in low-frequency (LF) range. Additional spectral modulation by the multiplicity of TGF peaks was found and demonstrated a good fit for two TGFs whose VLF sferics consist of two overlapping pulses each. The number of seeding pulses in TGF defines the spectral shape in VLF range, which allows to retrieve this number from VLF sferics, assuming they were radiated by TGFs. For two events it was found that the number of seeding pulses is small, of the order of 10. For the rest of the events the lower boundary of the number of seeding pulses was found to be between 10 to 103. ©2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114703
Appears in Collections: 气候减缓与适应
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作者单位: Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway; Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain; Electrical and Computer Engineering Department, Duke University, Durham, NC, United States
Recommended Citation:
Mezentsev A.,Lehtinen N.,Østgaard N.,et al. Spectral Characteristics of VLF Sferics Associated With RHESSI TGFs[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(1)