Abstract
Status and perspectives of the radio detection of high-energy cosmic rays are discussed with emphasis on recent developments at the LOFAR radio telescope and the Pierre Auger Observatory.
Highlights
High-energy cosmic rays impinging on the atmosphere of the Earth initiate cascades of secondary particles, the extensive air showers
One expects the radiation intensity being proportional to v × B, where v denotes the direction of the particles in the shower and B the Earth magnetic field
Combining the various efforts around the world one can state that the radio detection technique is mature and the properties of cosmic rays are being measured on a regular basis with such devices with state-of-the-art accuracies of the order of 0.1◦ to 0.5◦ for the arrival direction, 20% to 30% for the energy, and 20 to 40 g/cm2 for the depth of the shower maximum, with the accuracies mainly depending on the antenna density of the respective installation
Summary
High-energy cosmic rays impinging on the atmosphere of the Earth initiate cascades of secondary particles, the extensive air showers. A second, sub-dominant component arises through the longitudinal separation of charges in the shower (Askaryan effect [2]). Interference between the two radiation components with their different polarization behavior leads to a non-rotational symmetric distribution of the radiation intensity on the ground, as illustrated in Fig. 1 (left). This implies a non-trivial behavior of the lateral density distribution of the radio emission.
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