Sun/Moon photometer for the Cherenkov Telescope Array - first results
Jakub Jury\v{s}ek, Michael Prouza (the CTA consortium)

TL;DR
This paper discusses the use of a Sun/Moon photometer at the Cherenkov Telescope Array site for atmospheric monitoring, calibration, and aerosol optical depth retrieval, providing initial results from two months of data.
Contribution
It introduces a calibration method for nocturnal measurements and a modified cloud-screening technique for aerosol optical depth retrieval at the CTA site.
Findings
Distribution of aerosol optical depths in four passbands
Calibration method for nocturnal measurements
Modified cloud-screening technique
Abstract
Determination of the energy and flux of the gamma photons by Imaging Atmospheric Cherenkov Technique is strongly dependent on optical properties of the atmosphere. Therefore, atmospheric monitoring during the future observations of the Cherenkov Telescope Array (CTA) as well as anticipated long-term monitoring in order to characterize overal properties and annual variation of atmospheric conditions are very important. Several instruments are already installed at the CTA sites in order to monitor atmospheric conditions on long-term. One of them is a Sun/Moon photometer CE318-T, installed at the Southern CTA site. Since the photometer is installed at a place with very stable atmospheric conditions, it can be also used for characterization of its performance and testing of new methods of aerosol optical depth (AOD) retrieval, cloud-screening and calibration. In this work, we describe our…
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