Properties of Electromagnetic Signals Generated During the Development of Natural Lightning Discharges

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10440091" target="_blank" >RIV/00216208:11320/21:10440091 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mff.cuni.cz/veda/konference/wds/proc/pdf21/WDS21_08_f2_Kolinska.pdf" target="_blank" >https://www.mff.cuni.cz/veda/konference/wds/proc/pdf21/WDS21_08_f2_Kolinska.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Properties of Electromagnetic Signals Generated During the Development of Natural Lightning Discharges

Popis výsledku v původním jazyce

Analysis of electromagnetic signals emitted by natural lightning discharges is a way to investigate all evolution stages of lightning flashes. We present a study of the initiation stage for selected cloud-to-ground lightning flashes from the data collected in the Mediterranean during autumn 2015. We compared measurements of the broadband receiver BLESKA to the sources of narrowband very high frequency (VHF) radiation detected by the Lightning Mapping Array SAETTA. We verified the findings of Kolmašová et al. (2018) on a larger dataset: strong VHF signals detected by individual lightning mapping array (LMA) stations during the first 1-3 ms of the flash duration corresponded in time to the intense peaks of preliminary breakdown pulses. Such correlation indicates a fast step-like extension of lightning channels that leads to the emission of electromagnetic radiation in a wide range of frequencies. Using the 3D located VHF sources, we roughly estimated the altitude of lightning initiation and discussed it with respect to the locations of the charge regions in the thundercloud. We thus demonstrated the importance of using a combination of data from different measurements for 3D mapping of the development of the lightning channel inside the thundercloud.

Název v anglickém jazyce

Properties of Electromagnetic Signals Generated During the Development of Natural Lightning Discharges

Popis výsledku anglicky

Analysis of electromagnetic signals emitted by natural lightning discharges is a way to investigate all evolution stages of lightning flashes. We present a study of the initiation stage for selected cloud-to-ground lightning flashes from the data collected in the Mediterranean during autumn 2015. We compared measurements of the broadband receiver BLESKA to the sources of narrowband very high frequency (VHF) radiation detected by the Lightning Mapping Array SAETTA. We verified the findings of Kolmašová et al. (2018) on a larger dataset: strong VHF signals detected by individual lightning mapping array (LMA) stations during the first 1-3 ms of the flash duration corresponded in time to the intense peaks of preliminary breakdown pulses. Such correlation indicates a fast step-like extension of lightning channels that leads to the emission of electromagnetic radiation in a wide range of frequencies. Using the 3D located VHF sources, we roughly estimated the altitude of lightning initiation and discussed it with respect to the locations of the charge regions in the thundercloud. We thus demonstrated the importance of using a combination of data from different measurements for 3D mapping of the development of the lightning channel inside the thundercloud.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA20-09671S" target="_blank" >GA20-09671S: Výzkum bleskových výbojů na velkých i malých škálách</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

WDS&apos;21 Proceedings of Contributed Papers — Physics

ISBN

978-80-7378-455-3

ISSN

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e-ISSN

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Počet stran výsledku

9

Strana od-do

58-66

Název nakladatele

Matfyzpress

Místo vydání

Praha

Místo konání akce

Praha/ZOOM

Datum konání akce

15. 6. 2021

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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