DOI: 10.1002/2016JD025202
论文题名: Luminosity with intracloud-type lightning initial breakdown pulses and terrestrial gamma-ray flash candidates
作者: Stolzenburg M. ; Marshall T.C. ; Karunarathne S. ; Orville R.E.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 18 起始页码: 10919
结束页码: 10936
语种: 英语
英文关键词: gamma rays
; high-speed video
; initial breakdown
Scopus关键词: amplitude
; electric field
; energy budget
; gamma ray radiation
; light intensity
; lightning
; thundercloud
; videography
英文摘要: High-speed video data for four hybrid lightning flashes show luminosity bursts at visible wavelengths that are time-correlated with large, intracloud flash (IC) initial breakdown (IB) pulses in electric field change (E-change) data. The candidate IC-type IB pulses are large in range-normalized E-change amplitude and peak current (2.2-3.4 V/m at 100 km, 2.9-11.1 kA) and have slow (0.3-2.2 ms duration) field changes corresponding to charge moment changes of 0.5-15 C km. Such large amplitude IB pulses have been associated with production of terrestrial gamma-ray flashes in prior work. No gamma-ray observations were available for these events. In each flash, a luminosity increase was evident in the video data at the time of the largest IC-type IB pulses, when VHF sources and E-change data indicate the IC initial leader was at 6.1 - 9.4 km altitude and rapidly developing upward. Luminosity starts increasing within -10 µs to +20 µs of the main IC-type IB pulse peak, i.e., within the same 20-µs video frame as that in which the E-change peak occurs. Delay time between the beginning of the E-change pulse and beginning of the luminosity increase is 40-110 µs. Video intensities increase sharply for 80-220 µs to maximum value, then decrease over a longer period, with entire burst durations of 300-800 µs. The time lag between IB pulse peak and maximum luminosity is consistent with these IC-type IB pulses starting a large current that peaks and becomes bright at the time of the main pulse peak, and lasts for several hundred microseconds. ©2016. American Geophysical Union. All Rights Reserved. 资助项目: AGS-0813672
; AGS-1110030
; AGS-1427734
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62824
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 and Astronomy, University of Mississippi, University, MS, United States; Department of Atmospheric Sciences, Texas A&M University, College Station, TX, United States
Recommended Citation:
Stolzenburg M.,Marshall T.C.,Karunarathne S.,et al. Luminosity with intracloud-type lightning initial breakdown pulses and terrestrial gamma-ray flash candidates[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(18)