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.

EPJ Web Conf. Volume 216, 2019
Multiscale Dynamics

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