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Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown

  1. 1.
    0487518 - ÚFA 2018 RIV GB eng J - Článek v odborném periodiku
    Kolmašová, Ivana - Santolík, Ondřej - Defer, E. - Rison, W. - Coquillat, S. - Pedeboy, S. - Lán, Radek - Uhlíř, Luděk - Lambert, D. - Pinty, J.P. - Prieur, S. - Pont, V.
    Lightning initiation: Strong pulses of VHF radiation accompany preliminary breakdown.
    Scientific Reports. Roč. 8, č. 1 (2018), č. článku 3650. ISSN 2045-2322. E-ISSN 2045-2322
    Grant CEP: GA ČR GA17-07027S
    Grant ostatní: AV ČR(CZ) AP1401
    Program: Akademická prémie - Praemium Academiae
    Institucionální podpora: RVO:68378289
    Klíčová slova: controlled study * article * electromagnetic radiation * magnetic field * waveform * lightning * mapping array * discharges * ionosphere * luminosity * flashes * leaders * system
    Obor OECD: Fluids and plasma physics (including surface physics)
    Impakt faktor: 4.011, rok: 2018
    https://www.nature.com/articles/s41598-018-21972-z

    We analyze lightning initiation process using magnetic field waveforms of preliminary breakdown (PB) pulses observed at time scales of a few tens of microseconds by a broad-band receiver. We compare these pulses with sources of narrow-band very high frequency (VHF) radiation at 60–66 MHz recorded by two separate Lightning Mapping Arrays (LMAs). We find that almost none of the observed PB pulses correspond to geo-located VHF radiation sources, in agreement with previous results and with the hypothesis that processes generating VHF radiation and PB pulses are only weakly related. However, our detailed analysis discovers that individual peaks of strong VHF radiation seen by separate LMA stations correspond surprisingly well to the PB pulses. This result shows that electromagnetic radiation generated during fast stepwise extension of developing lightning channels is spread over a large interval of frequencies. We also show that intense VHF radiation abruptly starts with the first PB pulse and that it is then continuously present during the entire PB phase of developing discharges.
    Trvalý link: http://hdl.handle.net/11104/0282233

     
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