Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown

Abstract We analyze lightning initiation process using magnetic field waveforms of preliminary breakdown (PB) pulses observed at time scales of a few tens of microseconds by a broad-band receiver. We compare these pulses with sources of narrow-band very high frequency (VHF) radiation at 60–66 MHz re...

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Autores principales:	Ivana Kolmašová, Ondřej Santolík, Eric Defer, William Rison, Sylvain Coquillat, Stéphane Pedeboy, Radek Lán, Luděk Uhlíř, Dominique Lambert, Jean-Pierre Pinty, Serge Prieur, Véronique Pont
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/216ccfa857aa45c79039c32ed632b441
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spelling	oai:doaj.org-article:216ccfa857aa45c79039c32ed632b4412021-12-02T15:08:12ZLightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown10.1038/s41598-018-21972-z2045-2322https://doaj.org/article/216ccfa857aa45c79039c32ed632b4412018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-21972-zhttps://doaj.org/toc/2045-2322Abstract We analyze lightning initiation process using magnetic field waveforms of preliminary breakdown (PB) pulses observed at time scales of a few tens of microseconds by a broad-band receiver. We compare these pulses with sources of narrow-band very high frequency (VHF) radiation at 60–66 MHz recorded by two separate Lightning Mapping Arrays (LMAs). We find that almost none of the observed PB pulses correspond to geo-located VHF radiation sources, in agreement with previous results and with the hypothesis that processes generating VHF radiation and PB pulses are only weakly related. However, our detailed analysis discovers that individual peaks of strong VHF radiation seen by separate LMA stations correspond surprisingly well to the PB pulses. This result shows that electromagnetic radiation generated during fast stepwise extension of developing lightning channels is spread over a large interval of frequencies. We also show that intense VHF radiation abruptly starts with the first PB pulse and that it is then continuously present during the entire PB phase of developing discharges.Ivana KolmašováOndřej SantolíkEric DeferWilliam RisonSylvain CoquillatStéphane PedeboyRadek LánLuděk UhlířDominique LambertJean-Pierre PintySerge PrieurVéronique PontNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-10 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ivana Kolmašová Ondřej Santolík Eric Defer William Rison Sylvain Coquillat Stéphane Pedeboy Radek Lán Luděk Uhlíř Dominique Lambert Jean-Pierre Pinty Serge Prieur Véronique Pont Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown
description	Abstract We analyze lightning initiation process using magnetic field waveforms of preliminary breakdown (PB) pulses observed at time scales of a few tens of microseconds by a broad-band receiver. We compare these pulses with sources of narrow-band very high frequency (VHF) radiation at 60–66 MHz recorded by two separate Lightning Mapping Arrays (LMAs). We find that almost none of the observed PB pulses correspond to geo-located VHF radiation sources, in agreement with previous results and with the hypothesis that processes generating VHF radiation and PB pulses are only weakly related. However, our detailed analysis discovers that individual peaks of strong VHF radiation seen by separate LMA stations correspond surprisingly well to the PB pulses. This result shows that electromagnetic radiation generated during fast stepwise extension of developing lightning channels is spread over a large interval of frequencies. We also show that intense VHF radiation abruptly starts with the first PB pulse and that it is then continuously present during the entire PB phase of developing discharges.
format	article
author	Ivana Kolmašová Ondřej Santolík Eric Defer William Rison Sylvain Coquillat Stéphane Pedeboy Radek Lán Luděk Uhlíř Dominique Lambert Jean-Pierre Pinty Serge Prieur Véronique Pont
author_facet	Ivana Kolmašová Ondřej Santolík Eric Defer William Rison Sylvain Coquillat Stéphane Pedeboy Radek Lán Luděk Uhlíř Dominique Lambert Jean-Pierre Pinty Serge Prieur Véronique Pont
author_sort	Ivana Kolmašová
title	Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown
title_short	Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown
title_full	Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown
title_fullStr	Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown
title_full_unstemmed	Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown
title_sort	lightning initiation: strong pulses of vhf radiation accompany preliminary breakdown
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/216ccfa857aa45c79039c32ed632b441
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Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown

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