气候变化领域集成服务门户(CCPortal): Asymmetric Backward Peaking Radiation Pattern From a Relativistic Particle Accelerated by Lightning Leader Tip Electric Field

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DOI	10.1029/2020JD033204
	Asymmetric Backward Peaking Radiation Pattern From a Relativistic Particle Accelerated by Lightning Leader Tip Electric Field
	Yücemöz M.; Füllekrug M.
发表日期	2021
ISSN	2169897X
卷号	126 期号:13
英文摘要	Terrestrial Gamma ray Flashes exhibit slopes of ionizing radiation associated with bremsstrahlung. Bremsstrahlung has a continuous spectrum of radiation from radio waves to ionizing radiation. The Poynting vector of the emitted radiation, that is, the radiation pattern around a single particle under the external lightning electric field during interaction with other particles or atoms, is not quite well known. The overall radiation pattern arises from the combination of radiation of parallel and perpendicular motions of a particle caused by the acceleration from the lightning electric field and the bremsstrahlung. The calculations and displays of radiation patterns are generally limited to a low-frequency approximation for radio waves and separate parallel and perpendicular motions. Here, we report the radiation patterns of combined parallel and perpendicular motions from accelerated relativistic particles at low and high frequencies of the bremsstrahlung process with an external lightning electric field. The primary outcome is that radiation patterns have four relative maxima with two forward peaking and two backward peaking lobes. The asymmetry of the radiation pattern, that is, the different intensities of forward and backward peaking lobes, are caused by the Doppler effect. A novel outcome is that bremsstrahlung has an asymmetry of the four maxima around the velocity vector caused by the curvature of the particle's trajectory as it emits radiation. This mathematical modeling helps to better understand the physical processes of a single particle's radiation pattern, which might assist the interpretation of observations with networks of radio receivers and arrays of γ-ray detectors. © 2021. The Authors.
英文关键词	atmospheric electrodynamics; bremsstrahlung radiation; dipole; forward & backward peaking radiation pattern; lightning leader tip electric field; radiation pattern; Terrestrial Gamma-Ray Flashes (TGFs)
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/185123
作者单位	Department of Electronic and Electrical Engineering, Centre for Space, Atmospheric and Oceanic Science, University of Bath, Bath, United Kingdom
推荐引用方式 GB/T 7714	Yücemöz M.,Füllekrug M.. Asymmetric Backward Peaking Radiation Pattern From a Relativistic Particle Accelerated by Lightning Leader Tip Electric Field[J],2021,126(13).
APA	Yücemöz M.,&Füllekrug M..(2021).Asymmetric Backward Peaking Radiation Pattern From a Relativistic Particle Accelerated by Lightning Leader Tip Electric Field.Journal of Geophysical Research: Atmospheres,126(13).
MLA	Yücemöz M.,et al."Asymmetric Backward Peaking Radiation Pattern From a Relativistic Particle Accelerated by Lightning Leader Tip Electric Field".Journal of Geophysical Research: Atmospheres 126.13(2021).