Atmospheric aerosol attenuation effect on FD data analysis at the Pierre Auger Observatory

Abstract

The atmospheric aerosol monitoring system of the Pierre Auger Observatory has been operating smoothly since 2004. Two laser facilities (Central Laser Facility, CLF and eXtreme Laser Facility, XLF) fire sets of 50 shots four times per hour during FD shifts to measure the highly variable hourly aerosol attenuation to correct the longitudinal UV light profiles of the Extensive Air Showers detected by the Fluorescence Detector. Hourly aerosol attenuation loads (Vertical Aerosol Optical Depth) are used to correct the measured profiles. Two techniques are used to determine the aerosol profiles, which have been proven to be fully compatible. The uncertainty in the VAOD profiles measured consequently leads to an uncertainty on the energy and on the estimation of the depth at the maximum development of a shower (X max ) of the event in analysis. To prove the validity of the aerosol attenuation measurements used in FD event analysis, the flatness of the ratio of reconstructed SD to FD energy as a function of the aerosol transmission to the depth of shower maximum has been verified.

arXiv comment6 pages, 10 figures, poster at UHECR 2018 (Paris, Oct 2018)

References in corpus (7)

• The Pierre Auger Cosmic Ray Observatory
• A Study of the Effect of Molecular and Aerosol Conditions in the Atmosphere on Air Fluorescence Measurements at the Pierre Auger Observatory
• Description of Atmospheric Conditions at the Pierre Auger Observatory using the Global Data Assimilation System (GDAS)
• The Lidar System of the Pierre Auger Observatory
• Techniques for Measuring Aerosol Attenuation using the Central Laser Facility at the Pierre Auger Observatory
• Measurement of the Aerosol Phase Function at the Pierre Auger Observatory
• Identifying Clouds over the Pierre Auger Observatory using Infrared Satellite Data