气候变化领域集成服务门户(CCPortal): Needle Propagation and Twinkling Characteristics

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DOI	10.1029/2020JD034252
	Needle Propagation and Twinkling Characteristics
	Hare B.M.; Scholten O.; Dwyer J.; Strepka C.; Buitink S.; Corstanje A.; Falcke H.; Hörandel J.R.; Huege T.; Krampah G.K.; Mitra P.; Mulrey K.; Nelles A.; Pandya H.; Rachen J.P.; Thoudam S.; Trinh T.N.G.; ter Veen S.; Winchen T.
发表日期	2021
ISSN	2169897X
卷号	126 期号:6
英文摘要	Recently, a new lightning phenomena, termed needles, has been observed in both VHF and in optical along positive lightning leaders. They appear as small (<100 m) leader branches that undergo dielectric breakdown at regular intervals (called twinkles). Providing a coherent and consistent explanation for this phenomenon is challenging as each twinkle is a form of negative breakdown that propagates away from the positive leader. In this study, we provide detailed observations of needles in VHF, observed during two lightning flashes. We show distributions of different needle properties, including twinkle propagation speeds, time between twinkles, and needle lengths, among others. We show a return stroke and multiple recoil leaders that quench needle activity. We also show that nearby needle activity does not seem to correlate together, and that needle twinkling can slow down by 10%–30% per twinkle. We conclude by presenting possibilities for how the positive leader could induce negative propagation away from the positive channel, and we argue that twinkles can propagate like a stepped leader or like a recoil leader depending on the temperature of the needle, which implies that needle twinkles can probably propagate without emitting VHF. © 2021. The Authors.
英文关键词	imaging; lightning; LOFAR; mapping; needles; VHF
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/185389
作者单位	Faculty of Science and Engineering, Kapteyn Astronomical Institute, University of Groningen, Groningen, Netherlands; Interuniversity Institute for High-Energy, Vrije Universiteit Brussel, Brussels, Belgium; Department of Physics and Astronomy, University of New Hampshire, Durham, NH, United States; Department of Astrophysics/IMAPP, Radboud University Nijmegen, Nijmegen, Netherlands; Department of Physics, Astrophysical Institute, Vrije Universiteit Brussel, Brussels, Belgium; NIKHEF, Science Park Amsterdam, Amsterdam, Netherlands; Netherlands Institute of Radio Astronomy (ASTRON), Dwingeloo, Netherlands; Institute for Astroparticle Physics (IAP), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; DESY, Zeuthen, Germany; ECAP, Friedrich-Alexander-University Erlangen-Nrnberg, Erlangen, Germany; Department of Physics, Khalifa University, Abu Dhabi, United Arab Emirates; Department of Physics, School of Education, Can Tho University Campus II, Can Tho City, Viet Nam; Max-Planck-Institut für Radioast...
推荐引用方式 GB/T 7714	Hare B.M.,Scholten O.,Dwyer J.,et al. Needle Propagation and Twinkling Characteristics[J],2021,126(6).
APA	Hare B.M..,Scholten O..,Dwyer J..,Strepka C..,Buitink S..,...&Winchen T..(2021).Needle Propagation and Twinkling Characteristics.Journal of Geophysical Research: Atmospheres,126(6).
MLA	Hare B.M.,et al."Needle Propagation and Twinkling Characteristics".Journal of Geophysical Research: Atmospheres 126.6(2021).