The first flight of the Antarctic Impulsive Transient Antenna (ANITA) experiment recorded 14 radio signals that were emitted by downward going cosmic-ray induced air showers. The dominant contribution to the radiation comes from the deflection of positrons and electrons in the geomagnetic field and is beamed in a cone around the direction of motion of the air shower. This radiation is reflected from the ice and subsequently detected by the ANITA experiment at a flight altitude of -36 km. In this contribution, we estimate the cosmic-ray energy of the 14 individual events and find a mean energy of 2:9-1018 eV. By simulating the ANITA flight, we calculate its exposure for ultra-high energy cosmic rays (UHECRs) and we estimate for the first time the cosmic-ray flux derived only from radio observations.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2015|
|Event||34th International Cosmic Ray Conference, ICRC 2015 - The Hague, Netherlands|
Duration: Jul 30 2015 → Aug 6 2015
Bibliographical noteFunding Information:
We would like to thank Marianne Ludwig from Karlsruhe Institute of Technology for helpful discussions and in the early days of this work. We are grateful to NASA , the U.S. National Science Foundation , the U.S. Department of Energy , and the Columbia Scientific Balloon Facility for their generous support of these efforts. We would like to extend our thanks to the 2006–2007 on-ice LDB and McMurdo crews for their support. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. J.A.-M., W.R.C., D.G.-F., and E.Z. thank Ministerio de Economía (FPA2012-39489), Consolider-Ingenio 2010 CPAN Programme (CSD2007-00042), Xunta de Galicia (GRC2013-024), Feder Fundsand Marie Curie-IRSES/EPLANET (European Particle physics Latin American NETwork), and 7th Framework Program (PIRSES- 2009-GA-246806).