气候变化领域集成服务门户(CCPortal): Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges

CCPortal

DOI	10.1029/2019JD032151
	Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges
	Skeie C.A.; Østgaard N.; Lehtinen N.G.; Sarria D.; Kochkin P.; de Boer A.I.; Bardet M.; Allasia C.; Flourens F.
发表日期	2020
ISSN	2169897X
卷号	125 期号:14
英文摘要	During Airbus aircraft campaigns flying into thunderstorms in 2014–2016, X-rays were observed during two stages of aircraft-triggered lightning: nanosecond pulses of X-rays associated with negative leader steps and bursts of X-rays during recoil events. This work will focus on the observations of X-ray bursts associated with recoils. Recoils are observed as microsecond-fast changes in the local electric field, associated with large currents passing through the aircraft, and are found to sometimes be associated with bursts of X-rays. From over 200 aircraft-triggered lightning strikes, 54 recoil events were found to be associated with microsecond bursts of X-rays. The majority of the bursts consist of 1–3 X-ray pulses, with some bursts containing as many as 29 X-ray pulses. We compare the observed superposed X-ray spectrum with modeled spectra using a GEANT4 model of the detector and aircraft, to determine the source potential needed to accelerate the electrons that produce the observed X-rays. A model of the recoil leader was made to determine the gap distance and gap potential between the recoil leader and the aircraft. From the modeling, we determine a solution space for the gap and leader lengths where the gap length is constrained by the observed minimum and maximum times between the onset of the X-ray pulses and the onset of the current pulses detected at the aircraft (1 to 93 m). We also find two constraints from the fitting of the modeled spectra to the superposed spectrum, limiting the leader length to between 1 and ∼240 m. ©2020. The Authors.
英文关键词	aircraft-triggered lightning; ILDAS; lightning; recoil leaders
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185887
作者单位	Birkeland Centre for Space Science, Institute of Physics and Technology, University of Bergen, Bergen, Norway; Royal Netherlands Aerospace Centre, Amsterdam, Netherlands; Airbus, Toulouse, France
推荐引用方式 GB/T 7714	Skeie C.A.,Østgaard N.,Lehtinen N.G.,et al. Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges[J],2020,125(14).
APA	Skeie C.A..,Østgaard N..,Lehtinen N.G..,Sarria D..,Kochkin P..,...&Flourens F..(2020).Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges.Journal of Geophysical Research: Atmospheres,125(14).
MLA	Skeie C.A.,et al."Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges".Journal of Geophysical Research: Atmospheres 125.14(2020).