DOI: 10.1002/2014JD022080
论文题名: On the relationship between continuing current and positive leader growth
作者: Lapierre J.L. ; Sonnenfeld R.G. ; Edens H.E. ; Stock M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 2169897X
出版年: 2014
卷: 119, 期: 22 起始页码: 12479
结束页码: 12488
语种: 英语
英文关键词: continuing current
; electric field
; LEFA
; lightning
; LMA
; positive leader
Scopus关键词: cloud to ground lightning
; correlation
; electromagnetic field
; estimation method
英文摘要: It has long been speculated that the source of continuing current (CC) for a negative cloud-to-ground flash is provided by the growth of its positive leader into negative charge regions. In this study, data from the Langmuir Electric Field Array (LEFA) and Lightning Mapping Array (LMA) are used to investigate these speculations. LEFA and LMA data provide a way to estimate the occurrence and duration of CC and channel growth throughout a flash, respectively. By connecting LMA VHF sources onto contiguous channels, the growth of the positive leader associated with each return stroke is inferred. A linear correlation between positive-channel growth and CC duration is found, providing evidence that the positive leader grows with a constant velocity, but no obvious correlation of this velocity with CC occurrence is found. Each return stroke is then sorted by its channel growth rate and further identified by its CC type. This analysis also provides no identifiable correlation linking the positive-channel growth rate to CC occurrence or duration. Finally, the positive-channel growth rate for the whole flash is calculated in 10 ms windows so that any trends occurring before, during, or after the CC can be observed. This analysis too shows no correlation, which implies that positive-channel growth is not the primary mechanism that determines CC occurrence and duration. ©2014. 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/63045
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: Department of Physics, Langmuir Laboratory, New Mexico Institute of Mining and Technology, Socorro, NM, United States
Recommended Citation:
Lapierre J.L.,Sonnenfeld R.G.,Edens H.E.,et al. On the relationship between continuing current and positive leader growth[J]. Journal of Geophysical Research Atmospheres,2014-01-01,119(22)