气候变化领域集成服务门户(CCPortal): Combined Optical and Radio-Frequency Measurements of a Lightning Megaflash by the FORTE Satellite

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DOI	10.1029/2020JD034411
	Combined Optical and Radio-Frequency Measurements of a Lightning Megaflash by the FORTE Satellite
	Peterson M.; Light T.E.L.; Shao X.-M.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:15
英文摘要	The optical and VHF instrumentation on the fast on-orbit recording of transient events (FORTE) satellite is used to document the combined phenomenology evolution of a lightning “megaflash”—Mesoscale lightning that propagates laterally over exceptional distances. We identify a FORTE flash whose maximum extent was 82 km and inferred length over multiple distinct branches exceeded 100 km. This flash lasted 1.2 s and produced 250 optical and 591 radio frequency events. We find that the channel development mapped by FORTE's pixelated lightning imager (LLS) occurred at a typical speed of 2.6 × 105 m s−1 and was accompanied by sustained periods of VHF emission that could individually exceed 100 ms in duration. The impulsive IC events generated by the flash indicate that this development occurred at altitudes between 3 and 8 km. Four +CG strokes were identified in the VHF waveform data that are responsible for two of the three highly radiant LLS groups (two of the +CGs were not as optically bright as the others). These strokes occurred at different locations throughout the flash footprint with the most distant strokes separated by approximately 50 km. These space-based observations match previous observations of megaflashes as well as ground-based measurements of negative leader development during “spider” lightning, suggesting that FORTE is sensing the same phenomena. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	FORTE; lightning; megaflash; satellite observations
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/237091
作者单位	ISR-2, Los Alamos National Laboratory, Los Alamos, NM, United States
推荐引用方式 GB/T 7714	Peterson M.,Light T.E.L.,Shao X.-M.. Combined Optical and Radio-Frequency Measurements of a Lightning Megaflash by the FORTE Satellite[J],2021,126(15).
APA	Peterson M.,Light T.E.L.,&Shao X.-M..(2021).Combined Optical and Radio-Frequency Measurements of a Lightning Megaflash by the FORTE Satellite.Journal of Geophysical Research: Atmospheres,126(15).
MLA	Peterson M.,et al."Combined Optical and Radio-Frequency Measurements of a Lightning Megaflash by the FORTE Satellite".Journal of Geophysical Research: Atmospheres 126.15(2021).