气候变化领域集成服务门户(CCPortal): The Emission of Terrestrial Gamma Ray Flashes From Encountering Streamer Coronae Associated to the Breakdown of Lightning Leaders

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DOI	10.1029/2020GL089749
	The Emission of Terrestrial Gamma Ray Flashes From Encountering Streamer Coronae Associated to the Breakdown of Lightning Leaders
	Köhn C.; Heumesser M.; Chanrion O.; Nishikawa K.; Reglero V.; Neubert T.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:20
英文摘要	Terrestrial gamma ray flashes (TGFs) are beams of high-energy photons associated to lightning. These photons are the bremsstrahlung of energetic electrons whose origin is currently explained by two mechanisms: energizing electrons in weak, but large-scale thundercloud fields or the acceleration of low-energy electrons in strong, but localized fields of lightning leaders. Contemporary measurements by the Atmosphere-Space Interactions Monitor suggest that the production of TGFs is related to the leader step and associated streamer coronae when upward moving intracloud lightning illuminates. Based on these observations, we apply a particle-in-cell Monte Carlo code tracing electrons in the superposed electric field of two encountering streamer coronae and modeling the subsequent photon emission. We also perform a parameter study by solving the deterministic equations of motion for one electron. We find that this mechanism can explain the occurrence of TGFs with photons energies of several MeV lasting for tens to hundreds of μs, in agreement with observations. ©2020. The Authors.
英文关键词	Electrons; Equations of motion; Lightning; Photons; Deterministic equations; Energetic electron; High energy photons; Low energy electrons; Monte Carlo codes; Parameter studies; Photon emissions; Terrestrial Gamma ray Flashes; Gamma rays; acceleration; electric field; electron; gamma radiation; lightning; measurement method; Monte Carlo analysis; thundercloud
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169587
作者单位	National Space Institute (DTU Space), Technical University of Denmark, Kgs. Lyngby, Denmark; Department of Physics, Alabama A.&M. University, Normal, AL, United States; Image Processing Laboratory, University of Valencia, Valencia, Spain
推荐引用方式 GB/T 7714	Köhn C.,Heumesser M.,Chanrion O.,et al. The Emission of Terrestrial Gamma Ray Flashes From Encountering Streamer Coronae Associated to the Breakdown of Lightning Leaders[J],2020,47(20).
APA	Köhn C.,Heumesser M.,Chanrion O.,Nishikawa K.,Reglero V.,&Neubert T..(2020).The Emission of Terrestrial Gamma Ray Flashes From Encountering Streamer Coronae Associated to the Breakdown of Lightning Leaders.Geophysical Research Letters,47(20).
MLA	Köhn C.,et al."The Emission of Terrestrial Gamma Ray Flashes From Encountering Streamer Coronae Associated to the Breakdown of Lightning Leaders".Geophysical Research Letters 47.20(2020).