Enhancing Detection of Cosmic Rays through Improved Radio Emission Models

Recent research has focused on the radio emission from inclined air showers, particularly in the frequency range of 50-200 MHz, which is relevant for the Giant Radio Array for Neutrino Detection (GRAND). The study, conducted by Lukas Gülzow and colleagues, utilizes CoREAS air-shower simulations to refine an existing signal model to better fit this frequency band. The model specifically aims to isolate the geomagnetic component of the radio emission, which is crucial for accurately detecting ultra-high-energy particles in the atmosphere.

The researchers have developed a parameterization of the charge excess emission, allowing for the reconstruction of radiation energy from the air showers. This adaptation is significant as it enhances the sensitivity of the GRAND array to detect cosmic events that may otherwise go unnoticed. The findings are part of the NUTRIG project, which aims to improve the understanding of cosmic rays and their interactions with the Earth's atmosphere.

The implications of this research extend to the broader field of astrophysics, particularly in enhancing detection methods for high-energy cosmic events. Improved models and detection capabilities can lead to a better understanding of fundamental astrophysical processes and the nature of cosmic rays. The study is documented in the paper titled "Modelling the Radio Emission of Inclined Air Showers in the 50-200 MHz Frequency Band for GRAND" by Lukas Gülzow, Tim Huege, Kumiko Kotera, Olivier Martineau, Markus Roth, and Felix Schlüter, available on arXiv under the identifier arXiv:2408.17328.