DOI: 10.1002/2013JD020026
论文题名: M-component currents of first return strokes in natural negative cloud-to-ground lightning
作者: Visacro S. ; Araujo L. ; Guimarães M. ; Vale M.H.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 12132
结束页码: 12138
语种: 英语
英文关键词: First Return Stroke M Components
; Lightning Currents
; M-Component Currents
Scopus关键词: Electric fields
; Electric towers
; Luminance
; Cloud-to-ground lightning
; Continuing current
; Electric field change
; First returns
; Lightning channel
; Lightning currents
; M-components
; Triggered lightning
; Lightning
; atmospheric electricity
; cloud to ground lightning
; electric field
; videography
英文摘要: Records of M-component currents of first return strokes in natural negative cloud-to-ground lightning measured in a short instrumented tower are shown along with correlated video records, electric field changes, and relative luminosity. The synchronized fast-camera records clearly match the increase of luminosity of the faint lightning channel. The parameters of these M components are all consistent with those of triggered lightning. According to records of electric field change of lightning events near Morro do Cachimbo Station and of currents measured at the instrumented tower, the frequency of first return strokes exhibiting M components is within the range of tens of percent and not of a few percent, as usually accepted. This expectation of a few percent is based on a very low number of first return strokes expected to be followed by continuing currents. It was found that most of the analyzed first-return-stroke M components of natural lightning occur at the final phase of the return-stroke process and not during the flow of continuing currents. Apparently, this also holds true for most of the first M components of subsequent return strokes. Key Points M-component currents of first return strokes in natural lightning were measured First return strokes exhibiting M components are in the range of tens of percent ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63188
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: LRC - Lightning Research Center, UFMG, Federal University of Minas Gerais Minas Gerais, Av. Antonio Carlos 6.627 Pampulha, Belo Horizonte, Minas Gerais, 31270901, Brazil
Recommended Citation:
Visacro S.,Araujo L.,Guimarães M.,et al. M-component currents of first return strokes in natural negative cloud-to-ground lightning[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)