Articles | Volume 22, issue 12
https://doi.org/10.5194/acp-22-7959-2022
https://doi.org/10.5194/acp-22-7959-2022
Research article
 | 
20 Jun 2022
Research article |  | 20 Jun 2022

Continental thunderstorm ground enhancement observed at an exceptionally low altitude

Ivana Kolmašová, Ondřej Santolík, Jakub Šlegl, Jana Popová, Zbyněk Sokol, Petr Zacharov, Ondřej Ploc, Gerhard Diendorfer, Ronald Langer, Radek Lán, and Igor Strhárský

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Subject: Clouds and Precipitation | Research Activity: Field Measurements | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Cited articles

Arcanjo, M., Montanyà, J., Urbani, M., Lorenzo, V., and Pineda, N.​​​​​​​: Observations of corona point discharges from grounded rods under thunderstorms, Atmos. Res., 247, 105238, https://doi.org/10.1016/j.atmosres.2020.105238, 2021. 
Biggerstaff, M. I., Zounes, Z., Addison Alford, A., Carrie, G. D., Pilkey, J. T., Uman, M. A., and Jordan, D. M.: Flash propagation and inferred charge structure relative to radar-observed ice alignment signatures in a small Florida mesoscale convective system, Geophys. Res. Lett., 44, 8027–8036, https://doi.org/10.1002/2017GL074610, 2017. 
Boudard, A., Cugnon, J., David, J.-C., Leray, S., and Mancusi, D.: New potentialities of the Liège intranuclear cascade model for reactions induced by nucleons and light charged particles, Phys. Rev., C87, 014606, https://doi.org/10.1103/PhysRevC.87.014606, 2013. 
Brunetti, M., Cecchini, S., Galli, M., Giovannini, G., and Pagliarin, A.: Gamma-ray bursts of atmospheric origin in the MeV energy range, Geophys. Res. Lett., 27, 1599–1602, https://doi.org/10.1029/2000GL003750, 2000. 
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Short summary
Gamma ray radiation related to thunderstorms was previously observed at the high-altitude mountain observatories or on the western coast of Japan, usually being terminated by lightning discharges. We show unusual observations of gamma rays at an altitude below 1000 m, coinciding with peculiar rapid variations in the vertical electric field, which are linked to inverted intracloud lightning discharges. This indicates that a strong, lower positive-charge region was present inside the thundercloud.
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