Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astra...7..383a&link_type=abstract
Astrophysics and Space Sciences Transactions, Volume 7, Issue 3, 2011, pp.383-386
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Pierre Auger Observatory Fluorescence Detector (FD) performs a calorimetric measurement of the primary energy of cosmic ray showers. The level of accuracy of this technique is determined by the uncertainty in several parameters, among them the fraction of shower light (both from fluorescence and Cherenkov light) that reaches the detector after being multiply scattered (MS) in the atmosphere. This component depends on atmospheric conditions, namely on Rayleigh and Mie scattering processes. Using laser events it is possible to study these processes and deconvolute them from the shower's electromagnetic lateral distribution.
We propose a new method to measure the Rayleigh and Mie MS components seen in laser events, and correlate them with atmospheric conditions. In order to study in detail the effect of such conditions in the scattering of photons, a Geant4 dedicated laser simulation was developed.
In this framework photons are individually followed through the atmosphere allowing for any number of scatterings, from both processes This combination of a MS dedicated data analysis with a realistic laser simulation enables to explore MS characteristics, in particular the evolution with time, altitude and distance from the FD.
Assis Pedro
Conceição Ricardo
Gonçalves Patrícia
Pierre Auger Collaboration
Pimenta Mário
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