Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 96: Gammaastronomie V

T 96.8: Talk

Friday, March 19, 2010, 15:50–16:05, HG VII

Instrumentation for the observation of atmospheric parameters, relevant for IACTs, for site-search and correction of the energy spectra — •Christian Fruck, Jürgen Hose, Toni Engelhardt, Razmik Mirzoyan, Thomas Schweizer, and Masahiro Teshima — Max Plank Institut für Physik, Föhringer Ring 6, 80805 München

The atmospheric conditions have impact on the measured data by imaging atmospheric Cherenkov telescopes (IACT). Cherenkov light from air showers traverses ~5-25 km distance in the atmosphere before reaching the telescopes. This light becomes attenuated because of absorption by oxigen and ozone as well as because of the Rayleigh and the Mie scatterings. The latter is the variable component in the atmosphere that depends on the momentary distribution of aerosols, their size and types and distribution heights.

We have developed a micro-LIDAR system for parametrising these losses and plan to locate it next to the MAGIC telescopes for simulatneous operation. This shall allow us to improve the energy resolution of the telescopes for the data taken at non-ideal weather conditions.

Also, we are working on developing diverse instrumentation for paramerising the atmosphere and for the searching proper sites for the CTA project. In our presentation we plan to report about the above-mentioned activities.