Energy and flux measurements of ultra-high energy cosmic rays observed during the first ANITA flight
Proceedings of Science 30-July-2015 (2015)
Authors:
H Schoorlemmer, K Belov, A Romero-Wolf, D García-Fernández, V Bugaev, SA Wissel, P Allison, J Alvarez-Muñiz, SW Barwick, JJ Beatty, DZ Besson, WR Binns, WR Carvalho, C Chen, P Chen, JM Clem, A Connolly, PF Dowkontt, MA DuVernois, RC Field, D Goldstein, PW Gorham, C Hast, CL Heber, T Huege, S Hoover, MH Israel, A Javaid, J Kowalski, J Lam, JG Learned, KM Liewer, JT Link, E Lusczek, S Matsuno, BC Mercurio, C Miki, P Miocinović, K Mulrey, J Nam, CJ Naudet, J Ng, RJ Nichol, K Palladino, BF Rauch, J Roberts, K Reil, B Rotter, M Rosen, L Ruckman, D Saltzberg, D Seckel, D Urdaneta, GS Varner, AG Vieregg, D Walz, F Wu, E Zas
Abstract:
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.