# Review on Cosmic-Ray Radio Detection (VULCANO 2016)

## TL;DR

This review discusses recent advances in radio detection of cosmic-ray air showers, highlighting its progress, current capabilities, and potential to complement existing measurement techniques for studying ultra-high-energy cosmic rays.

## Contribution

It provides a comprehensive overview of the development, current status, and experimental validation of radio detection methods for cosmic-ray air showers.

## Key findings

- Radio detection techniques now align with established methods in precision.
- Multiple digital antenna arrays operate globally for cosmic-ray studies.
- Radio detection can enhance the accuracy of cosmic-ray observatories.

## Abstract

Extensive air showers still are our only access to the highest-energy particles in the universe, namely cosmic-ray nuclei with energies up to several 100 EeV. Studying open questions in cosmic-ray physics, like their yet unknown origin requires the reconstruction of the energy and mass of the primary particles from the air-shower measurements. Great progress has been achieved lately in the development of the radio detection technique for this purpose. There now is a consistent picture of the mechanisms behind the radio emission, which is in agreement with measurements. Several second-generation, digital antenna arrays are operating in different parts of the world not only aiming at the further development of the technique, but also contributing to cosmic-ray physics at energies above 100 PeV. Recently it has been demonstrated experimentally that radio detection can compete in precision with established techniques for air showers, like the measurement of secondary particles on ground, or fluorescence and Cherenkov light emitted by air showers. Consequently, cosmic-ray observatories can benefit from radio extensions to maximize their total measurement accuracy.