Initial Breakdown Pulses Accompanied by VHF Pulses During Negative Cloud‐to‐Ground Lightning Flashes

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F19%3A00505114" target="_blank" >RIV/68378289:_____/19:00505114 - isvavai.cz</a>
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL082488" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL082488</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2019GL082488" target="_blank" >10.1029/2019GL082488</a>

Result language
angličtina
Original language name
Initial Breakdown Pulses Accompanied by VHF Pulses During Negative Cloud‐to‐Ground Lightning Flashes
Original language description
This study compares waveforms recorded by“broadband”very low frequency/low‐frequency/medium‐frequency (VLF/LF/MF) electricfield change sensors (bandwidth ~0–2.5 MHz) and very highfrequency (VHF) sensors (bandwidth 186–192 MHz) during the initiation of 20 negative cloud‐to‐groundlightningflashes. In thefirst 2 ms of eachflash, initial breakdown (IB) pulses are detected with the VLF/LF/MF sensors. Comparison shows that all classical IB pulses are accompanied by VHF pulses, where classicalIB pulses are defined herein as bipolar with duration >10μs and amplitude >25% of the largest IB pulseamplitude in theflash. There are on average 47% of IB pulses (of all amplitudes and durations) that areaccompanied by VHF pulses within ±1μs. There are also many VHF pulses with no associated IB pulses.These observations indicate that the initial in‐cloud lightning channel extension process (es) occurs very fastand at multiple length scales, since substantial electromagnetic radiation is emitted in the VLF/LF/MF andVHF bands.
Czech name
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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
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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
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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