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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA17-07027S" target="_blank" >GA17-07027S: Analýza elektromagnetických projevů bouřkové aktivity za použití pozemních a satelitních měření ve více bodech či více přístroji současně</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Geophysical Research Letters

ISSN

0094-8276

e-ISSN

—

Svazek periodika

46

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

5592-5600

Kód UT WoS článku

000471237500065

EID výsledku v databázi Scopus

2-s2.0-85066300203