Atmospheric Effects on the Development and the Fluorescence Detection of Extensive Air Showers

Details Atmospheric Effects on the Development and the Fluorescence Detection of Extensive Air Showers Atmospheric Effects on the Development and the Fluorescence Detection of Extensive Air Showers

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2..879k&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

3

Scientific paper

Radiosonde measurements of atmospheric profiles above the Pampa Amarilla in Argentina, the location of the southern Pierre Auger Observatory, have been carried out. A detailed knowledge of the atmospheric conditions and its variations is mandatory esp ecially for the fluorescence technique of air shower observations. The atmosphere influences the shower development and the detection in several ways: Firstly, the shower development is mainly determined by the amount of traversed matter. However, fluorescence telescopes observe the geometrical development. For the transformation from depth to geometrical height, the air density profile is required, otherwise misinterpretations of the shower maximum depth of order 30-50 g/cm2 are possible. Secondly, the fluorescence efficiency of air depends on the local pressure and temperature. And thirdly, the propagation of light is affected by attenuation and scattering, again depending on the air density profile. The measured air pressure and temperature profiles, taken in all 4 seasons up to altitudes of 25 km, and the resulting variables are presented. The importance of in-situ measurements for the interpretation of fluorescence observations is discussed.

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