Articles | Volume 25, issue 3
https://doi.org/10.5194/acp-25-1791-2025
https://doi.org/10.5194/acp-25-1791-2025
Research article
 | 
10 Feb 2025
Research article |  | 10 Feb 2025

Post-return stroke VHF electromagnetic activity in north-western Mediterranean cloud-to-ground lightning flashes

Andrea Kolínská, Ivana Kolmašová, Eric Defer, Ondřej Santolík, and Stéphane Pédeboy

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Cited articles

Clarence, N. D. and Malan, D. J.: Preliminary discharge processes in lightning flashes to ground, Q. J. Roy. Meteor. Soc., 83, 161–172, 1957. 
Coquillat, S., Defer, E., de Guibert, P., Lambert, D., Pinty, J.-P., Pont, V., Prieur, S., Thomas, R. J., Krehbiel, P. R., and Rison, W.: SAETTA: high-resolution 3-D mapping of the total lightning activity in the Mediterranean Basin over Corsica, with a focus on a mesoscale convective system event, Atmos. Meas. Tech., 12, 5765–5790, https://doi.org/10.5194/amt-12-5765-2019, 2019.  
de Guibert, P. and Coquillat, S.: L1 SAETTA science data, Aeris [data set], https://doi.org/10.25326/236, 2021. 
Edens, H. E., Eack, K. B., Eastvedt, E. M., Trueblood, J. J., Winn, W. P., Krehbiel, P. R., Aulich, G. D., Hunyady, S. J., Murray, W. C., Rison, W., Behnke, S. A., and Thomas, R. J.: VHF lightning mapping observations of a triggered lightning flash, Geophys. Res. Lett., 39, L19807, https://doi.org/10.1029/2012GL053666, 2012. 
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Short summary
We contribute to understanding differences in lightning flashes of opposite polarity by explaining distinct in-cloud processes after return strokes. Using data from multiple sensors, including individual Lightning Mapping Array stations, we reveal that positive flashes sustain strong high-frequency radiation due to the recharging of their in-cloud leader; this is in contrast to negative flashes, for which this activity declines rapidly.
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