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Radiodétection des gerbes atmosphériques à l'observatoire Pierre Auger

Abstract : The understanding on the ultra high cosmic rays (E>10^{18} eV) issue has been improved over the last decade, especially through the noteworthy results of the Pierre Auger Observatory. The composition of cosmic rays at those energies is still an open matter. The EASIER project (Extensive Air Shower Identification using Electron Radiometer) on radio detection of extensive air showers is looking for new observables related to the nature of primary cosmic rays, complementary to those already implemented at the Pierre Auger Observatory. This prototype consists of an array of MHz and GHz antennas, set up on a slave mode on about sixty tanks of the surface detector of the Observatory. Further to a study of the antenna response and a data analysis, the features of the detected signals at MHz frequencies have turned out to be compatible with a geomagnetic origin of the shower radio emission. At GHz frequencies, only a few signals have been detected in coincidence with extensive air showers. A simulation program has been created, aiming to identify the origin of this micro wave emission. It includes the air shower development in the atmosphere and different emission mechanisms at GHz frenquencies : the Cerenkov radiation and the molecular bremsstrahlung. The radiation propagation through the atmosphere and the receiving antenna response are simulated as well, allowing to directly compare the detected signals to the predicted ones.
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  • HAL Id : tel-01400693, version 1

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Sandra Le Coz. Radiodétection des gerbes atmosphériques à l'observatoire Pierre Auger. Phénomènes cosmiques de haute energie [astro-ph.HE]. Université de Grenoble, 2014. Français. ⟨NNT : 2014GRENY073⟩. ⟨tel-01400693⟩

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