Radioelectric Field Features of Extensive Air Showers Observed with CODALEMA

D. Ardouin (1) , A. Belletoile (1) , Didier Charrier (1) , Richard Dallier (1) , L. Denis (2) , P. Eschstruth (3) , Thierry Gousset (1) , Ferid Haddad (1) , J. Lamblin (1) , Pascal Lautridou (1) , A. Lecacheux (4) , D. Monnier-Ragaigne (3) , O. Ravel (1) , T. Saugrin (1) , S. Valcares (1)

1 SUBATECH - Laboratoire SUBATECH Nantes
2 USN - Unité Scientifique de la Station de Nançay
3 LAL - Laboratoire de l'Accélérateur Linéaire
4 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique

Based on a new approach to the detection of radio transients associated with extensive air showers induced by ultra high energy cosmic rays, the experimental apparatus CODALEMA is in operation, measuring about 1 event per day corresponding to an energy threshold ~ 5. 10^16 eV. Its performance makes possible for the first time the study of radio-signal features on an event-by-event basis. The sampling of the magnitude of the electric field along a 600 meters axis is analyzed. It shows that the electric field lateral spread is around 250 m (FWHM). The possibility to determine with radio both arrival directions and shower core positions is discussed.

Mots clés: Radio detection; Ultra-high-energy cosmic rays; Ultra High Energy Cosmic Rays PACS: 9555Jz; 9585Ry; 9640-z

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

D. Ardouin, A. Belletoile, Didier Charrier, Richard Dallier, L. Denis, et al.. Radioelectric Field Features of Extensive Air Showers Observed with CODALEMA. Astroparticle Physics, 2006, 26 (4-5), pp.341-350. ⟨10.1016/j.astropartphys.2006.07.002⟩. ⟨in2p3-00111825⟩