Observation of ultrahigh-energy cosmic rays with the ANITA balloon-borne radio interferometer.

  title={Observation of ultrahigh-energy cosmic rays with the ANITA balloon-borne radio interferometer.},
  author={Sally L. Hoover and J Nam and Peter W. Gorham and Eric William Grashorn and P. Allison and Steven W. Barwick and James J. Beatty and Kiril Belov and D. Z. Besson and W Robert Binns and Changfeng Chen and Pisin Chen and John M. Clem and Andrew Connolly and P. F. Dowkontt and M. A. Duvernois and Richard C. Field and Dan Goldstein and Antonie Vieregg and Carsten Hast and M. H. Israel and Akmal Javaid and J. Kowalski and John G. Learned and Kurt M. Liewer and Jakob Link and Elizabeth R. Lusczek and Shigenobu Matsuno and B. C. Mercurio and Christian Miki and Predrag Mio{\vc}inovi{\'c} and Charles J. Naudet and Jack Ng and Ryan J O Nichol and Karen Palladino and Kevin Reil and Andrew Romero-Wolf and Michael Rosen and Larry L. Ruckman and David Saltzberg and David Seckel and Gary S. Varner and Dieter Walz and Fan Wu},
  journal={Physical review letters},
  volume={105 15},
We report the observation of 16 cosmic ray events with a mean energy of 1.5 × 10¹⁹ eV via radio pulses originating from the interaction of the cosmic ray air shower with the Antarctic geomagnetic field, a process known as geosynchrotron emission. We present measurements in the 300-900 MHz range, which are the first self-triggered, first ultrawide band, first far-field, and the highest energy sample of cosmic ray events collected with the radio technique. Their properties are inconsistent with… CONTINUE READING