Multi-instrument Observations of Elves and Their Causative Lightning Strokes Associated with a Small-scale Central European Winter Thunderstorm

0508357 - ÚFA 2020 SG eng A - Abstrakt
Kolmašová, Ivana - Santolík, Ondřej - Spurný, Pavel - Borovička, Jiří - Mlynarczyk, J. - Kašpar, Petr - Popek, Martin - Pizzuti, A. - Zacharov, Petr, jr. - Lán, Radek - Uhlíř, Luděk - Bennet, A. - Füllekrug, M. - Diendorfer, G. - Slošiar, R.
Multi-instrument Observations of Elves and Their Causative Lightning Strokes Associated with a Small-scale Central European Winter Thunderstorm.
Abstracts of AOGS : 16th Annual Meeting. Singapore: Asia Oceania Geosciences Society, 2019. AS47-D3-PM1-P-233.
[AOGS Annual Meeting /16./. 28.07.2019-02.08.2019, Singapore]
Institucionální podpora: RVO:68378289 ; RVO:67985815
Klíčová slova: thunderstorm * lightning strokes * lightning discharges * VLF measurements * EUCLID lightning detection network
Obor OECD: Fluids and plasma physics (including surface physics); Fluids and plasma physics (including surface physics) (ASU-R)
http://www.asiaoceania.org/aogs2019/public.asp?page=browse_abstract.htm

We present observations of elves produced by a small-scale winter thunderstorm which occurred on 2 April 2017 in the southwest of Czechia. Elves and associated positive lightning strokes have been simultaneously recorded by different observational techniques. Optical data include video recordings of TLEs from Nydek (Czechia) and data recorded by high time-resolution photometers at several stations of the Czech fireball network which measured the brightness originating from lightning return strokes. Electromagnetic data sets include 3-component VLF measurements conducted in Rustrel (France), 2-component ELF measurements recorded at the Hylaty station (Poland), measurements of currents induced by the quasi-electrostatic component of lightning in Portishead (United Kingdom), and intensity variations of a VLF transmitter (DHO38, Rhauderfehn, Germany) recorded in Bojnice (Slovakia). Optical and electromagnetic data are combined with positions and peak currents of all strokes recorded during the observed thunderstorm by the EUCLID lightning detection network. We focus our analysis on positive lightning discharges with high peak currents and we compare properties of those which produced elves with properties of discharges for which elves were not detected. The current moment waveforms and charge moment changes associated with these energetic events are reconstructed from the ELF electromagnetic signals. Based on our observation and the modelling results we hypothesize that formation of elves requires not only a high-peak current of its causative stroke but also a high conductivity of the lightning channel and a high velocity of the current wave front.
Trvalý link: http://hdl.handle.net/11104/0299288