Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F18%3A00487518" target="_blank" >RIV/68378289:_____/18:00487518 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/18:10389400
Result on the web
<a href="http://dx.doi.org/10.1038/s41598-018-21972-z" target="_blank" >http://dx.doi.org/10.1038/s41598-018-21972-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41598-018-21972-z" target="_blank" >10.1038/s41598-018-21972-z</a>

Result language
angličtina
Original language name
Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown
Original language description
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.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/GA17-07027S" target="_blank" >GA17-07027S: Analysis of electromagnetic manifestations of thunderstorms using multi-point and multi-instrument ground-based and satellite measurements</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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