Radio Morphing - towards a full parametrisation of the radio signal from air showers

TL;DR

This paper introduces a comprehensive parametrisation method for simulating radio signals from air showers, significantly reducing computational costs and enabling large-scale or mountainous area studies in cosmic ray detection.

Contribution

The paper presents a novel full parametrisation approach for the radio emission from air showers, improving simulation efficiency for large or complex terrains.

Findings

Reduces simulation time by orders of magnitude.

Enables efficient modeling of radio signals in mountainous regions.

Supports large-scale cosmic ray detection experiments.

Abstract

Over the last decades, radio detection of air showers has been established as a detection technique for ultra-high-energy cosmic-rays impinging on the Earth's atmosphere with energies far beyond LHC energies. Today's second-generation of digital radio-detection experiments, as e.g. AERA or LOFAR, are becoming competitive in comparison to already standard techniques e.g. fluorescence light detection. Thanks to a detailed understanding of the physics of the radio emission in extensive air showers, simulations of the radio signal are already successfully tested and applied in the reconstruction of cosmic rays. However, the limits of the computational power resources are easily reached when it comes to computing electric fields at the numerous positions requested by large or dense antenna arrays. In the case of mountainous areas as e.g. for the GRAND array, where 3D shower simulations are necessary, the problem arises with even stronger acuity. Therefore we developed a full parametrisation of the emitted radio signal on the basis of generic shower simulations which will reduce the simulation time by orders of magnitudes. In this talk we will present this concept after a short introduction to the concept of the radio detection of air-shower induced by cosmic rays.