| Literature DB >> 21230887 |
S Hoover1, J Nam, P W Gorham, E Grashorn, P Allison, S W Barwick, J J Beatty, K Belov, D Z Besson, W R Binns, C Chen, P Chen, J M Clem, A Connolly, P F Dowkontt, M A DuVernois, R C Field, D Goldstein, A G Vieregg, C Hast, M H Israel, A Javaid, J Kowalski, J G Learned, K M Liewer, J T Link, E Lusczek, S Matsuno, B C Mercurio, C Miki, P Miočinović, C J Naudet, J Ng, R J Nichol, K Palladino, K Reil, A Romero-Wolf, M Rosen, L Ruckman, D Saltzberg, D Seckel, G S Varner, D Walz, F Wu.
Abstract
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 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.Entities:
Year: 2010 PMID： 21230887 DOI： 10.1103/PhysRevLett.105.151101
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161