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The Auger Engineering Radio Array (AERA) is an enhancement of the PierreAuger Observatory in Argentina. Covering about View the $17\,$km$^2$, AERA isthe world-largest antenna array for cosmic-ray observation. It consists of morethan 150 antenna stations detecting the radio signal emitted by air showers,i.e., cascades of secondary particles caused by primary cosmic rays hitting theatmosphere. At the beginning, technical goals had been in focus: first of all,the successful demonstration that a large-scale antenna array consisting ofautonomous stations is feasible. Moreover, techniques for calibration of theantennas and time calibration of the array have been developed, as well asspecial software for the data analysis. Meanwhile physics goals come intofocus. At the Pierre Auger Observatory air showers are simultaneously detectedby several detector systems, in particular water-Cherenkov detectors at thesurface, underground muon detectors, and fluorescence telescopes, which enablescross-calibration of different detection techniques. For the direction andenergy of air showers, the precision achieved by AERA is already competitive;for the type of primary particle, several methods are tested and optimized. Bycombining AERA with the particle detectors we aim for a better understanding ofcosmic rays in the energy range from approximately $0.3$ to $10\,$EeV, i.e.,significantly higher energies than preceding radio arrays.

Radio detection of high-energy cosmic rays with the Auger Engineering Radio Array (PISA 2015)