CoREAS simulations of inclined air showers predict refractive displacement of the radio-emission footprint

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 18:00
ZOOM-Meeting URL: https://icrc2021.desy.de/pf_access_abstracts
Corresponding Session: https://icrc2021-venue.desy.de/channel/Presenter-Forum-1-Evening-All-Categories/48
Abstract:
"Simulating the radio emission of inclined extensive air showers for a ground based radio-antenna array we find a systematic displacement of the radio emission with respect to the Monte-Carlo shower impact point. We corrected the radio-emission footprint for the asymmetries due to the superposition of geomagnetic and charge-excess radiation as well as for the early-late effect. The remaining displacement is found to be SI{sim 1500}{m} along the ground plane for showers with a zenith angle of SI{85}{degree}, which is relevant for air shower detectors.rnA model describing this displacement by refraction in the atmosphere based on Snell's law yields good agreement with our observations from CoREAS simulations.rnWe thus conclude that the displacement is caused by refraction in the atmosphere."

Authors: Marvin Gottowik | Tim Huege | Julian Rautenberg | Felix Schlüter
Indico-ID: 1360
Proceeding URL: https://pos.sissa.it/395/277