Observation of ultrahigh-energy cosmic rays with the ANITA balloon-borne radio interferometer |
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| Authors: | Hoover S Nam J Gorham P W Grashorn E Allison P Barwick S W Beatty J J Belov K Besson D Z Binns W R Chen C Chen P Clem J M Connolly A Dowkontt P F DuVernois M A Field R C Goldstein D Vieregg A G Hast C Israel M H Javaid A Kowalski J Learned J G Liewer K M Link J T Lusczek E Matsuno S Mercurio B C Miki C Mio?inovi? P Naudet C J Ng J Nichol R J Palladino K Reil K Romero-Wolf A Rosen M Ruckman L Saltzberg D Seckel D Varner G S Walz D Wu F |
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| Institution: | Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA. |
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| Abstract: | We report the observation of 16 cosmic ray events with a mean energy of 1.5 × 101? 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 current ground-based geosynchrotron models. The emission is 100% polarized in the plane perpendicular to the projected geomagnetic field. Fourteen events are seen to have a phase inversion due to reflection of the radio beam off the ice surface, and two additional events are seen directly from above the horizon. Based on a likelihood analysis, we estimate angular pointing precision of order 2° for the event arrival directions. |
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