High-energy radiation from natural lightning observed in coincidence with a VHF broadband interferometer
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Tipus de documentArticle
Data publicació2021-04-16
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Abstract
This work presents the first simultaneous X-ray measurements from natural lightning in coincidence with a very high frequency (VHF) broadband interferometer. During an observational campaign in north-central Colombia, five intense X-ray bursts were detected from negative stepped leaders and two X-ray emissions from a dart leader. Thanks to the high angular and time resolution of the interferometer, it was possible to locate the origin of high-energy radiation during the lightning leader propagation. We study the correlation with VHF pulses and the two-dimensional speed of the leader channels. A strong temporal correspondence has been observed between the high-energy emissions and the most intense VHF pulses, which suggests the runaway electrons as a shared mechanism. The observations show that an X-ray burst can have multiple high-energy sources belonging to different leader branches, that can be several hundreds of meters apart. Therefore, from a spatial point of view, not a unique origin has to be searched, but an extensive origin of the X-ray burst should be considered. We hypothesize similar conclusions in particular for downward TGFs and maybe for TGFs in general.
CitacióUrbani, M. [et al.]. High-energy radiation from natural lightning observed in coincidence with a VHF broadband interferometer. "Journal of geophysical research: atmospheres", 16 Abril 2021, vol. 126, núm. 7, p. e2020JD033745:1-e2020JD033745:23.
ISSN2169-8996
Versió de l'editorhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JD033745
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Urbani_2021.pdf | Accepted version | 4,002Mb | Visualitza/Obre |