DOI: 10.1002/2013GL059180
论文题名: Photographic observations of streamers and steps in a cloud-to-air negative leader
作者: Edens H.E. ; Eack K.B. ; Rison W. ; Hunyady S.J.
刊名: Geophysical Research Letters
ISSN: 0094-10343
EISSN: 1944-10074
出版年: 2014
卷: 41, 期: 4 起始页码: 1336
结束页码: 1342
语种: 英语
英文关键词: air discharge
; corona brush
; intragroup flash
; leader step
; lightning mapping
; space leader
Scopus关键词: Brushes
; Sea level
; Air discharge
; Cloud-to-ground flash
; Digital still cameras
; Intra-group
; leader step
; Lightning mapping array
; Photographic observation
; space leader
; Lightning
; array
; digital image
; lightning
; magnitude
; observational method
; photograph
; photography
英文摘要: A color photograph has been obtained of a negative lightning leader in clear air at 10.3 km altitude. The individual leader steps are resolved as relatively straight segments of at least ~200 m in length, between sharp kinks (nodes) in the channel. Each node is accompanied by a group of streamers of ~100 m in length. One node has an unconnected secondary leader with streamers at both ends. Lightning Mapping Array observations show that the leader was part of an intracloud (IC) flash. The observation shows that steps of negative leaders near 10 km altitude are an order of magnitude longer than values reported in the literature for negative leaders near sea level. Since negative leaders propagate at comparable velocities at low and high altitudes, stepping occurs at a lower rate in IC flashes, which can explain why RF emissions from IC flashes are more intermittent than those from cloud-to-ground flashes. Key Points Steps of negative leaders near 10 km altitude are a minimum of 200 m in length Leader steps at high altitude are completed at a lower rate than at low altitude Faint leader and streamer phenomena can be imaged by digital still cameras ©2014. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894252800&doi=10.1002%2f2013GL059180&partnerID=40&md5=55560f6cafb813745797bd19f8a3e114
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7607
Appears in Collections: 气候减缓与适应
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作者单位: Langmuir Laboratory for Atmospheric Research, New Mexico Institute of Mining and Technology, Socorro NM, United States
Recommended Citation:
Edens H.E.,Eack K.B.,Rison W.,et al. Photographic observations of streamers and steps in a cloud-to-air negative leader[J]. Geophysical Research Letters,2014-01-01,41(4).