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Paper: Three-dimensional Nanosecond Radio Imaging of Cosmic Rays and Other Things
Volume: 395, Frontiers of Astrophysics: A Celebration of NRAO's 50th Anniversary
Page: 271
Authors: Falcke, H.
Abstract: The detection of cosmic particles with radio antennas has seen a major revival in recent years due to the availability of phased arrays and digital radio receivers. The LOPES experiment has detected the radio emission from cosmic rays, confirmed the geosynchrotron effect for extensive air showers, and provided a good calibration formula to convert the radio signal into primary particle energy. Future steps will be the installation of radio antennas at the Auger experiment to measure the composition of ultra-high-energy cosmic rays and the usage of the LOFAR radio telescope (and later the SKA) as a cosmic-ray detector. Since the cosmic-ray radio emission is produced in the near field, we have developed a 3-D radio imaging technique that allows one to image cosmic-ray radio flashes on the nanosecond time scale using raw baseband sampled time-domain data as input. This technique could also be of interest for imaging terrestrial lightning and for searching for sub-second bursts from astrophysical sources.
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