Atmospheric multiple scattering of fluorescence light from extensive air showers and effect of the aerosol size on the reconstruction of energy and depth of maximum

The reconstruction of the energy and the depth of maximum Xmax of an extensive air shower depends on the multiple scattering of fluorescence photons in the atmosphere. In this work, we explain how atmospheric aerosols, and especially their size, scatter the fluorescence photons during their propagat...

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Veröffentlicht in:Astroparticle physics 2014-05, Vol.57-58, p.6-15
Hauptverfasser: Louedec, Karim, Colombi, Joshua
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description The reconstruction of the energy and the depth of maximum Xmax of an extensive air shower depends on the multiple scattering of fluorescence photons in the atmosphere. In this work, we explain how atmospheric aerosols, and especially their size, scatter the fluorescence photons during their propagation. Using a Monte Carlo simulation for the scattering of light, the dependence on the aerosol conditions of the multiple scattered light contribution to the recorded signal is fully parameterised. A clear dependence on the aerosol size is proposed for the first time. Finally, using this new parameterisation, the effect of atmospheric aerosols on the energy and on the Xmax reconstructions is presented for a vertical extensive air shower observed by a ground-based detector at 30km: for typical aerosol conditions, multiple scattering leads to a systematic over-estimation of 5±1.5% for the energy and 4.0±1.5g/cm2 for the Xmax, where the uncertainties refer to a variation of the aerosol size.
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subjects Aerosol
Air-fluorescence technique
Astrophysics
Atmospheric and Oceanic Physics
Atmospheric effect
Cosmic ray
Extensive air shower
High Energy Physics - Experiment
Instrumentation and Methods for Astrophysic
Multiple scattering
Physics
Sciences of the Universe
title Atmospheric multiple scattering of fluorescence light from extensive air showers and effect of the aerosol size on the reconstruction of energy and depth of maximum
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