Speaker
Description
The Auger Radio Infill SKALA Extension (ARISE) was installed in 2025 at the Pierre Auger Observatory to detect the radio emission in the band of 50-350 MHz of near-vertical cosmic-ray air showers at energies of 10s to 100s PeV. The array comprises 18 SKALA-2 antennas deployed around one of the surface-detector stations of the 433m infill array (SD-433), which provides the trigger for ARISE. We present first measurements with ARISE and show the detection of radio pulses associated with extensive air showers. Radio signals are found in coincidence with SD-433 events, and a comparison of the arrival directions reconstructed from the radio and surface detector signals confirms the measurement of air showers with ARISE. These observations provide a first assessment of the detector setup and demonstrate the potential of ARISE for radio detection of near-vertical air showers.