The highest energy cosmic rays remain elusive and mysterious, and their study requires extraordinary efforts.
Maxwell’s unified description of electric and magnetic phenomena is one of the greatest achievements of 19th century physics.
Cosmic rays are energetic particles, mostly atomic nuclei, raining down upon the Earth from the depths of the cosmos.
One of the biggest challenges in cosmic-ray physics is to accurately pin down the absolute energy of a measured cosmic ray.
Billions of subatomic particles can be created in cosmic-ray induced air showers.
The Auger Engineering Radio Array (AERA) measures radio properties of cosmic-ray induced air showers within the Pierre Auger Observatory.