气候变化领域集成服务门户(CCPortal): Modeling initial breakdown pulses of intracloud lightning flashes

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DOI	10.1016/j.atmosres.2021.105734
	Modeling initial breakdown pulses of intracloud lightning flashes
	Karunarathne N.; Marshall T.C.; Karunarathne S.; Stolzenburg M.
发表日期	2021
ISSN	0169-8095
卷号	261
英文摘要	In this study 29 initial breakdown pulses (IBPs) from four intracloud (IC) lightning flashes are modeled using data from five or more electric field change (E-change) sites. For each flash the first 5–9 located IBPs are investigated. For each IBP the modeling first extracts the IBP current waveform from the E-change data by matrix inversion and then determines the best channel length and current velocity to match the IBP data. Derived IBP quantities of total charge, charge moment, peak current, peak radiated power, and total energy are calculated. Resulting IBP vertical lengths varied from 27 m to 1300 m; most values were 100–500 m. Current velocities ranged over 4.0–20.0 × 107 m/s, with most values 10–16.5 × 107 m/s. Two of these IC flashes had two “extraordinary” IBPs each with very large E-change amplitude and multiple subpulses; these four extraordinary IBPs had longer current rise times than fall times and charge moments of −3.45 to −20.06C km. Subpulses of classic IBPs were coincident with, and likely caused by, smaller current pulses superimposed on the main IBP current. Overall, most of the 29 IC IBPs had peak current amplitudes <120 kA and total (negative) charge <2C, while the four extraordinary IB pulses had peak currents of 217–359 kA and total charges of −8.4C to −71.7C. The four extraordinary IBPs all have the characteristics of Energetic In-cloud Pulses (EIPs), which are thought to be the radio signals of events producing terrestrial gamma-ray flashes (TGFs). The extraordinary IBPs may have caused double-pulse TGFs and overlapping TGFs. © 2021 The Authors
英文关键词	IBPs; Initial breakdown pulses; Intracloud lightning; Lightning; Matrix inversion; Preliminary breakdown pulses
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236659
作者单位	Department of Physics and Astronomy, University of MississippiMS, United States
推荐引用方式 GB/T 7714	Karunarathne N.,Marshall T.C.,Karunarathne S.,et al. Modeling initial breakdown pulses of intracloud lightning flashes[J],2021,261.
APA	Karunarathne N.,Marshall T.C.,Karunarathne S.,&Stolzenburg M..(2021).Modeling initial breakdown pulses of intracloud lightning flashes.Atmospheric Research,261.
MLA	Karunarathne N.,et al."Modeling initial breakdown pulses of intracloud lightning flashes".Atmospheric Research 261(2021).