Atmospheric Aerosol Attenuation Measurements at the Pierre Auger Observatory

10 Jun 2013, 11:10
CEA Saclay

CEA Saclay

Talk Monitoring facilities in operation Monday morning


Dr Laura Valore (Universita' di Napoli Federico II)


The Fluorescence Detector (FD) of the Pierre Auger Observatory provides a nearly calorimetric measurement of the primary particle energy, since the fluorescence light produced is proportional to the energy dissipated by an Extensive Air Shower (EAS) in the atmosphere. The atmosphere is therefore assimilable to a giant calorimeter, whose properties need to be well known during data taking. Aerosols play a key role in this scenario, since the light transmission through aerosols is highly variable even on a time scale of one hour, and the corresponding correction to EAS energy can range from a few percent to more than 40%. For this reason, hourly Vertical Aerosol Optical Depth (VAOD) profiles are provided for each of the four FD stations. Starting from 2004, up to now 9 years of VAOD profiles have been produced using data from the Central Laser Facility (CLF) and the eXtreme Laser Facility (XLF) of the Pierre Auger Observatory. The two laser facilities, the techniques developed to measure the VAOD profiles using laser data and the results will be discussed.

Primary author

Dr Laura Valore (Universita' di Napoli Federico II)

Presentation Materials