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The Cherenkov Telescope Array (CTA) will be the next generation observatoryemploying different types of Cherenkov telescopes for the detection of particleshowers initiated by very-high-energy gamma rays. A good knowledge of theEarth's atmosphere, which acts as a calorimeter in the detection technique,will be crucial for calibration in CTA. Variations of the atmosphere'stransparency to Cherenkov light and not correctly performed calibration ofindividual telescopes in the array result in large systematic uncertainties onthe energy scale. The Cherenkov Transparency Coefficient (CTC), developedwithin the H.E.S.S. experiment, quantifies the mean atmosphere transparencyascertained from data taken by Cherenkov telescopes during scientificobservations. Provided that atmospheric conditions over the array are uniform,transparency values obtained per telescope can be also used for the calibrationof individual telescope responses. The application of the CTC in CTA presents achallenge due to the greater complexity of the observatory and the variety oftelescope cameras compared with currently operating experiments, such asH.E.S.S. We present here the first results of a feasibility study for extensionof the CTC concept in CTA for purposes of the inter-calibration of thetelescopes in the array and monitoring of the atmosphere.

Atmospheric monitoring and array calibration in CTA using the Cherenkov Transparency Coefficient