Subionospheric propagation and peak currents of preliminary breakdown pulses before negative cloud-to-ground lightning discharges

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F16%3A00455897" target="_blank" >RIV/68378289:_____/16:00455897 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/16:10334120

Výsledek na webu

<a href="http://dx.doi.org/10.1002/2015GL067364" target="_blank" >http://dx.doi.org/10.1002/2015GL067364</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2015GL067364" target="_blank" >10.1002/2015GL067364</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Subionospheric propagation and peak currents of preliminary breakdown pulses before negative cloud-to-ground lightning discharges

Popis výsledku v původním jazyce

We analyze broadband electromagnetic measurements of pulse sequences occurring prior to first return strokes of negative cloud-to-ground lightning flashes. Signals generated by lightning discharges were recorded close to the thunderstorm by a magnetic field receiver and traveled up to 600 km to three distant electric field receivers. We found that amplitudes of observed preliminary breakdown pulses, as well as amplitudes of the corresponding return strokes, are attenuated approximately by 2 dB/100 km when propagating in the Earth-ionosphere waveguide over mountainous terrain. Propagation simulations show that there is a significant contribution of the sky wave signals in the waveforms observed beyond 500 km from their source. The estimated peak currents of the largest preliminary breakdown pulses reach over 60 kA. Such current pulses propagating through in-cloud lightning leader channels in a strong electric field may be able to initiate terrestrial gamma ray flashes.

Název v anglickém jazyce

Subionospheric propagation and peak currents of preliminary breakdown pulses before negative cloud-to-ground lightning discharges

Popis výsledku anglicky

We analyze broadband electromagnetic measurements of pulse sequences occurring prior to first return strokes of negative cloud-to-ground lightning flashes. Signals generated by lightning discharges were recorded close to the thunderstorm by a magnetic field receiver and traveled up to 600 km to three distant electric field receivers. We found that amplitudes of observed preliminary breakdown pulses, as well as amplitudes of the corresponding return strokes, are attenuated approximately by 2 dB/100 km when propagating in the Earth-ionosphere waveguide over mountainous terrain. Propagation simulations show that there is a significant contribution of the sky wave signals in the waveforms observed beyond 500 km from their source. The estimated peak currents of the largest preliminary breakdown pulses reach over 60 kA. Such current pulses propagating through in-cloud lightning leader channels in a strong electric field may be able to initiate terrestrial gamma ray flashes.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

—

Projekt

<a href="/cs/project/GA14-31899S" target="_blank" >GA14-31899S: Družicová, balonová a pozemní meření elektromagnetických projevů bouřkové aktivity</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

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

43

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

1382-1391

Kód UT WoS článku

000372056600054

EID výsledku v databázi Scopus

2-s2.0-84975763724