A study of lightning flash initiation prior to the first initial breakdown pulse

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F19%3A00495325" target="_blank" >RIV/68378289:_____/19:00495325 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/19:10407437

Result on the web

<a href="http://dx.doi.org/10.1016/j.atmosres.2018.10.013" target="_blank" >http://dx.doi.org/10.1016/j.atmosres.2018.10.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.atmosres.2018.10.013" target="_blank" >10.1016/j.atmosres.2018.10.013</a>

Result language

angličtina

Original language name

A study of lightning flash initiation prior to the first initial breakdown pulse

Original language description

This study examines the initiation of two intracloud (IC) and two cloud-to-ground (CG) lightning flashes using electric field change (FA) sensors and VHF (LogRF) sensors located at seven sites near Oxford, Mississippi, USA. For each flash the initiating event caused a pulse in the LogRF data and started an Initial E-Change (IEC) in the FA data. The initiating LogRF pulses had powers <1 W and durations of ~1 μs. Numerous LogRF pulses occurred during each IEC: these pulses had durations ≤3 μs. Fewer FA pulses occurred during each IEC: these pulses had durations of ≤7 μs. During each IEC, a few of the LogRF pulses were coincident with a FA pulse, and most such pairs of pulses enhanced the IEC: no IEC enhancing events occurred without such a coincident pair. Each flash had 1 or 2 IEC enhancing events soon after the initiating event and 1 or 2 enhancing events shortly before the first classic initial breakdown (IB) pulse occurred. The point dipole moments and durations of IECs of the two IC flashes were (520C m, 620 μs) and (770C m, 1790 μs) and for the two CG flashes were (9C m, 124 μs) and (36C m, 130 μs). We speculate that the LogRF events were positive corona streamers, that enhancing events occurred when a new streamer extended a previous streamer path, and that this process during the flash initiation developed a nascent channel needed for the negative breakdown of the IB pulses.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

—

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

Name of the periodical

Atmospheric Research

ISSN

0169-8095

e-ISSN

—

Volume of the periodical

217

Issue of the periodical within the volume

1 March

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

10-23

UT code for WoS article

000452931100002

EID of the result in the Scopus database

2-s2.0-85055630098