PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Cosmic-Ray Indirect. CRI-instrumentation EAS
Improvements to aerosol attenuation measurements at the Pierre Auger Observatory
M. Malacari* on behalf of the Pierre Auger Collaboration
*corresponding author
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
Abstract
Sound knowledge of the aerosol loading in the atmosphere above the Pierre Auger Observatory is essential for the accurate reconstruction of shower energy deposit profiles using the atmospheric fluorescence technique. The vertical aerosol optical depth is inferred from hourly measurements of the vertically-fired UV laser beams of the Observatory’s central laser facilities via two complementary techniques. We report on recent refinements made to these aerosol analysis techniques, and on verification of the resulting aerosol measurements through internal consistency checks using reconstructed air shower data. These analysis improvements include accounting for the shape of the aerosol scattering phase function, and the treatment of multiple scattered light from the laser beam. The cumulative effect of these improvements is a modest increase in the measured vertical aerosol optical depth above the Observatory. We will discuss the impact of this increase on the reconstruction of showers measured with the Observatory’s fluorescence detector.
DOI: https://doi.org/10.22323/1.301.0398
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