Skip to Main content Skip to Navigation
Journal articles

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 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.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03671651
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, May 19, 2022 - 7:53:56 AM
Last modification on : Wednesday, June 1, 2022 - 4:25:03 AM

File

s41598-018-21972-z.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

Ivana Kolmašová, Ondřej Santolík, Eric Defer, William Rison, Sylvain Coquillat, et al.. Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown. Scientific Reports, 2018, 8, ⟨10.1038/s41598-018-21972-z⟩. ⟨insu-03671651⟩

Share

Metrics

Record views

17

Files downloads

0