During thunderstorm conditions the radio footprint (intensity as well as polarization) of cosmic ray showers deviates strongly from those measured during fair weather. We have been able to interpret this pattern in terms of atmospheric electric fields. We see that even when there is no thunderstorm activity within 100 km distance within an hour of the event, the radio footprint may be strongly affected.

8th International Conference on Acoustic and Radio EeV Neutrino Detection Activities (ARENA 2018)
Centrum Wiskunde & Informatica, Amsterdam (CWI), The Netherlands

Trinh, G., Scholten, O., Ebert, U., Leijnse, H., & Rutjes, C. (2019). Determining atmospheric electric fields through radio emission from air showers. In EPJ Web of Conferences (pp. 03010:1–03010:3). doi:10.1051/epjconf/201921603010