Preprint/Report

PUBDB-2018-00823

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Sun/Moon photometer for the Cherenkov Telescope Array - first results

Juryšek, J. (Corresponding author) ; Prouza, M. ; Cherenkov Telescope Array Consortium (Collaboration author)DESY*

2017

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Please use a persistent id in citations: doi:10.3204/PUBDB-2018-00823

Report No.: arXiv:1708.07484

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 calibration method for nocturnal measurements and the modification of cloud-screening for purposes of nocturnal AOD retrieval. We applied these methods on two months of observations and present the distribution of AODs in four photometric passbands together with their uncertainties.

Note: All CTA contributions at arXiv:1709.03483. Accepted for publicationon PoS, PoS(ICRC2017)853, Proceedings of the 35th ICRC 2017, Busan, Korea

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Contributing Institute(s):

1. Cherenkov Telescope Array (ZEU-CTA)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)

Experiment(s):

1. Cherenkov Telescope Array

Appears in the scientific report 2017

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