Hoover, S; Nam, J; Gorham, PW; Grashorn, E; Allison, P; Barwick, SW; Beatty, JJ; ... Wu, F; + view all Hoover, S; Nam, J; Gorham, PW; Grashorn, E; Allison, P; Barwick, SW; Beatty, JJ; Belov, K; Besson, DZ; Binns, WR; Chen, C; Chen, P; Clem, JM; Connolly, A; Dowkontt, PF; DuVernois, MA; Field, RC; Goldstein, D; Vieregg, AG; Hast, C; Israel, MH; Javaid, A; Kowalski, J; Learned, JG; Liewer, KM; Link, JT; Lusczek, E; Matsuno, S; Mercurio, BC; Miki, C; Miocinovic, P; Naudet, CJ; Ng, J; Nichol, RJ; Palladino, K; Reil, K; Romero-Wolf, A; Rosen, M; Ruckman, L; Saltzberg, D; Seckel, D; Varner, GS; Walz, D; Wu, F; - view fewer (2010) Observation of Ultrahigh-Energy Cosmic Rays with the ANITA Balloon-Borne Radio Interferometer. PHYS REV LETT , 105 (15) , Article 151101. 10.1103/PhysRevLett.105.151101.

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Abstract

We report the observation of 16 cosmic ray events with a mean energy of 1: 5 x 10(19) 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 degrees for the event arrival directions.

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