Properties of the unusually short pulse sequences occurring prior to the first strokes of negative cloud-to-ground lightning flashes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10289664" target="_blank" >RIV/00216208:11320/14:10289664 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378289:_____/14:00431949

Výsledek na webu

<a href="http://dx.doi.org/10.1002/2014GL060913" target="_blank" >http://dx.doi.org/10.1002/2014GL060913</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/2014GL060913" target="_blank" >10.1002/2014GL060913</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Properties of the unusually short pulse sequences occurring prior to the first strokes of negative cloud-to-ground lightning flashes

Popis výsledku v původním jazyce

We analyze broadband magnetic and electric field measurements of pulse sequences occurring prior to first return strokes of negative cloud-to-ground lightning flashes. Our observations take place a few tens of kilometers from the thunderstorm but we alsoreport the first simultaneous observations of preliminary breakdown pulses from a distance of 400 km. Their amplitudes reach up to 50% of the corresponding return stroke peak and typically decrease by similar to 40% during the sequences. A typical timeinterval between neighboring pulses was several tens of microseconds. We observe an unusually short duration of the prestroke activity (1-7 ms) reported for the first time during a summer thunderstorm, with a low height of initiation (3-4 km). A very fast propagation speed (similar to 10(6) m/s) is probably maintained for the entire prestroke process. A possible explanation can be based on a hypothesis of unusually strong negative charge sources in the observed thundercloud.

Název v anglickém jazyce

Properties of the unusually short pulse sequences occurring prior to the first strokes of negative cloud-to-ground lightning flashes

Popis výsledku anglicky

We analyze broadband magnetic and electric field measurements of pulse sequences occurring prior to first return strokes of negative cloud-to-ground lightning flashes. Our observations take place a few tens of kilometers from the thunderstorm but we alsoreport the first simultaneous observations of preliminary breakdown pulses from a distance of 400 km. Their amplitudes reach up to 50% of the corresponding return stroke peak and typically decrease by similar to 40% during the sequences. A typical timeinterval between neighboring pulses was several tens of microseconds. We observe an unusually short duration of the prestroke activity (1-7 ms) reported for the first time during a summer thunderstorm, with a low height of initiation (3-4 km). A very fast propagation speed (similar to 10(6) m/s) is probably maintained for the entire prestroke process. A possible explanation can be based on a hypothesis of unusually strong negative charge sources in the observed thundercloud.

Druh

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

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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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

2014

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

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Svazek periodika

41

Číslo periodika v rámci svazku

14

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

5316-5324

Kód UT WoS článku

000340536000053

EID výsledku v databázi Scopus

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