Temperature and Humidity Dependence of Air Fluorescence Yield measured by AIRFLY

Details Temperature and Humidity Dependence of Air Fluorescence Yield measured by AIRFLY Temperature and Humidity Dependence of Air Fluorescence Yield measured by AIRFLY

2007-11-28

arxiv.org/abs/0711.4583v1

Nucl.Instrum.Meth.A597:50-54,2008

Astronomy and Astrophysics

Astrophysics

presented at the 5th Fluorescence Workshop, El Escorial - Madrid, Spain, 16 - 20 September 2007, to appear in Nuclear Instrume

Scientific paper

10.1016/j.nima.2008.08.050

The fluorescence detection of ultra high energy cosmic rays requires a detailed knowledge of the fluorescence light emission from nitrogen molecules over a wide range of atmospheric parameters, corresponding to altitudes typical of the cosmic ray shower development in the atmosphere. We have studied the temperature and humidity dependence of the fluorescence light spectrum excited by MeV electrons in air. Results for the 313.6 nm, 337.1 nm, 353.7 nm and 391.4 nm bands are reported in this paper. We found that the temperature and humidity dependence of the quenching process changes the fluorescence yield by a sizeable amount (up to 20%) and its effect must be included for a precise estimation of the energy of ultra high energy cosmic rays.

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