The city of Malargüe, home of the Pierre Auger Cosmic Ray Observatory, welcomed dozens of scientists from around the world who met to discuss the advances in research on ultra-high energy cosmic rays. The UHECR Symposium – Ultra High Energy Cosmic Ray – is held every two years in different parts of the world and this was the first time that Argentina hosted the event through the Pierre Auger Observatory and the Institute of Detection and Astroparticle Technologies -ITeDA-, dependent on the CNEA, CONICET and UNSAM.

UHECR 2024 activities began on Sunday, November 17, the day after the signing of the Extension of the International Agreement of the Pierre Auger Observatory for its operation until 2035. As a welcome to the symposium, attendees took a guided tour of the Auger site, where the surface detectors and ultrasensitive fluorescence telescopes that make up the observatory are installed.

The agenda continued at the Thesaurus Convention and Exhibition Center in Malargüe and at the headquarters of the Pierre Auger Observatory, with an exhaustive week of presentations, collaborative talks, poster sessions, reports from working groups and debates that included topics such as: The origin of cosmic rays; Acceleration to the highest energies; Propagation of cosmic rays; Galactic and extragalactic magnetic fields; Transition from galactic to extragalactic flow; Hadronic interactions related to the interpretation of extensive air showers; Multi-messenger connections of cosmic rays, neutrinos, gamma rays and gravitational waves; Physics beyond the standard model, among others.