A simple flux integration photometer for day time site testing at Oukaimeden |
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Authors: | Z Benkhaldoun S Kadiri M Lazrek J Vernin |
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Institution: | (1) Laboratoire d'Astronomie et de Geophysique (L.A.G.), Centre National de Coordination et de Planification de la Recherche Scientifique et Technique (C.N.C.P.R.S.T.), BP 1346 RP, Rabat, Maroc;(2) Department d'Astrophysique U.R.A. 709 du C.N.R.S., Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France |
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Abstract: | We describe here a simple irradiance photometer built at Astrophysical and Geophysical Laboratory (LAG) for the integrated photometry of sun light at Oukaimeden, a 2700m summit in the Morrocan High Atlas. The solar irradiance measurement is performed simultaneously at three wavelengths to sample different levels of the sky transparency. The total of 1182 days in the data base shows that the number of clear hours is about 3086 per year which represents 65.32% of clear sky. The extinction coefficient is computed to evaluate the quality of the sky transparency at the site. We find that there is a seasonal effect for the sky transparency, and the monthly average of the extinction coefficient has a minimum value of about 0.05 in winter (oct-nov-dec) and a maximum of about 0.15 in summer (jun-jul) at 700 nm. |
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Keywords: | Site testing photometry earth atmosphere cloud cover extinction |
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