Modelling the Radio Emission of Inclined Cosmic-Ray Air Showers in the 50−200 MHz Frequency Band for GRAND

Ultra-high energy (UHE) cosmic rays and neutrinos induce particle cascades in the atmosphere, called extensive air showers. The Giant Radio Array for Neutrino Detection (GRAND) is designed for measuring the radio emission of inclined air showers to cover a larger detection area. It will consist of multiple sub-arrays and a total area of 200 000 km2 with one radio antenna per square kilometre. At full capacity, GRAND will detect UHE neutrinos, gaining information on the sources they share with UHE cosmic rays. In contrast to existing arrays, GRAND will operate on radio events alone, hence efficient radio triggering techniques are in development. We use CORSIKA air-shower simulations to update a detailed signal model of the radio emission of inclined showers for the wide 50−200 MHz frequency band GRAND is sensitive to. This talk gives an overview on radio emissions of extensive air showers, details of the signal model, and how it will be instrumental for event reconstruction for large-scale detector systems and the development of the autonomous radio trigger*.

* NUTRIG project, ANR-DFG Funding Programme (490843803)