S. Acounis, Université de Nantes
D. Charrier, Université de Nantes
T. Garçon, Université de Nantes
C. Rivière, Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
P. Stassi, Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
P. Abreu, Instituto Superior Técnico
M. Aglietta, Università degli Studi di Torino
M. Ahlers, University of Wisconsin-Madison
E. J. Ahn, Fermi National Accelerator Laboratory
I. F.M. Albuquerque, Universidade de São Paulo
I. Allekotte, Centro Atomico Bariloche
J. Allen, New York University
P. Allison, The Ohio State University
A. Almela, Comision Nacional de Energia Atomica Argentina
J. Alvarezcastillo, Universidad Nacional Autónoma de México
J. Alvarez-Muñiz, Universidad de Santiago de Compostela
R. Alves Batista, Universidade Estadual de Campinas
M. Ambrosio, Università degli Studi di Napoli Federico II
A. Aminaei, Radboud Universiteit
L. Anchordoqui, University of Wisconsin-Milwaukee
S. Andringa, Instituto Superior Técnico
T. Antǐci'c, Rudjer Boškovi'c Institute
C. Aramo, Università degli Studi di Napoli Federico II
F. Arqueros, Universidad Complutense de Madrid
H. Asorey, Centro Atomico Bariloche
P. Assis, Instituto Superior Técnico
J. Aublin, Laboratoire de Physique Nucléaire et de Hautes Energies
M. Ave, Universidad de Santiago de Compostela
M. Avenier, IN2P3 - Institut National de Physique Nucléaire et de Physique Des Particules
G. Avila, Pierre Auger Observatory
A. M. Badescu, University Politehnica of Bucharest
K. B. Barber, The University of Adelaide
A. F. Barbosa

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We describe the experimental setup and the results of RAuger, a small radio-antenna array, consisting of three fully autonomous and self-triggered radio-detection stations, installed close to the center of the Surface Detector (SD) of the Pierre Auger Observatory in Argentina. The setup has been designed for the detection of the electric field strength of air showers initiated by ultra-high energy cosmic rays, without using an auxiliary trigger from another detection system. Installed in December 2006, RAuger was terminated in May 2010 after 65 registered coincidences with the SD. The sky map in local angular coordinates (i.e., zenith and azimuth angles) of these events reveals a strong azimuthal asymmetry which is in agreement with a mechanism dominated by a geomagnetic emission process. The correlation between the electric field and the energy of the primary cosmic ray is presented for the first time, in an energy range covering two orders of magnitude between 0.1 EeV and 10 EeV. It is demonstrated that this setup is relatively more sensitive to inclined showers, with respect to the SD. In addition to these results, which underline the potential of the radio-detection technique, important information about the general behavior of self-triggering radio-detection systems has been obtained. In particular, we will discuss radio self-triggering under varying local electric-field conditions.

Publication Source (Journal or Book title)

Journal of Instrumentation