Description of Atmospheric Conditions at the Pierre Auger Observatory using the Global Data Assimilation System (GDAS)
The Pierre Auger Collaboration: P. Abreu, M. Aglietta, M. Ahlers, E., J. Ahn, I. F. M. Albuquerque, D. Allard, I. Allekotte, J. Allen, P. Allison,, A. Almela, J. Alvarez Castillo, J. Alvarez-Mu\~niz, M. Ambrosio, A. Aminaei,, L. Anchordoqui, S. Andringa, T. Anti\v{c}i\'c
TL;DR
This paper evaluates the use of GDAS atmospheric data for reconstructing cosmic ray air showers at the Pierre Auger Observatory, demonstrating its accuracy and utility compared to local measurements.
Contribution
It introduces the application of GDAS atmospheric profiles to air shower reconstruction and validates its effectiveness against local measurements.
Findings
GDAS data closely matches local radiosonde measurements.
Using GDAS improves air shower reconstruction accuracy.
Monthly averaged GDAS profiles are reliable for the observatory.
Abstract
Atmospheric conditions at the site of a cosmic ray observatory must be known for reconstructing observed extensive air showers. The Global Data Assimilation System (GDAS) is a global atmospheric model predicated on meteorological measurements and numerical weather predictions. GDAS provides altitude-dependent profiles of the main state variables of the atmosphere like temperature, pressure, and humidity. The original data and their application to the air shower reconstruction of the Pierre Auger Observatory are described. By comparisons with radiosonde and weather station measurements obtained on-site in Malarg\"ue and averaged monthly models, the utility of the GDAS data is shown.
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