Speaker
Description
Radio detection of air showers has become a standard technique for indirect measurement of the highest energy Galactic and extragalactic cosmic rays. Geomagnetic and Askaryan radio emission are detectable around the clock, and a number of radio arrays have achieved measurement accuracies for the arrival direction, energy and position of the shower maximum competitive with traditional optical detection techniques. Radio antennas have thus become a valuable enhancement to particle-detector arrays, which provide the trigger. In particular, in the combination with muon detectors, radio-particle hybrid measurements increase the sensitivity for the mass of the primary particle and provide unique capabilities to test hadronic interaction models. While already demonstrated for cosmic-ray air showers, radio detection is also of interest for other cosmic messengers above approximately 10 PeV, especially, for photons and neutrinos. As the radio emission originates primarily from the electromagnetic shower component, a combination of radio antennas and muon detectors can be used to separate light and heavy cosmic rays on an event-by-event bases, and to search for gamma rays by selecting muon-poor showers. Self-triggered balloon-borne radio detectors, in-ice radio arrays, and radio detectors on mountains search for neutrino-induced particle cascades and are about to become the most sensitivity experiments for ultra-high-energy neutrinos.