ISSN:
1572-9508
Keywords:
Site testing
;
photometry
;
earth atmosphere
;
cloud cover
;
extinction
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00395985
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