Observation of Ultra-high-energy Cosmic Rays with the ANITA Balloon-borne Radio Interferometer

S. Hoover , J. Nam , P. W. Gorham , E. Grashorn , P. Allison , S. W. Barwick , J. J. Beatty , K. Belov

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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 C. L. Hebert 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. Mio\v{c}inovi\'c 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

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classification 🌌 astro-ph.HE astro-ph.IM

keywords radiocosmicemissioneventsfieldgeomagneticgeosynchrotronobservation

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We report the observation of sixteen cosmic ray events of 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 the first ultra-wideband, far-field measurements of the radio spectral density of geosynchrotron emission in the range from 300-1000 MHz. The emission is 100% linearly polarized in the plane perpendicular to the projected geomagnetic field. Fourteen of our observed 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.

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Observation of Ultra-high-energy Cosmic Rays with the ANITA Balloon-borne Radio Interferometer

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