Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2011-12-16
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
Accepted MNRAS (November 2011), 10 pages, 14 figures
Scientific paper
San Pedro M\'artir in the Northwest of Mexico is the site of the Observatorio Astron\'omico Nacional. It was one of the five candidates sites for the Thirty Meter Telescope, whose site-testing team spent four years measuring the atmospheric properties on site with a very complete array of instrumentation. Using the public database created by this team, we apply a novel method to solar radiation data to estimate the daytime fraction of time when the sky is clear of clouds. We analyse the diurnal, seasonal and annual cycles of cloud cover. We find that 82.4 per cent of the time the sky is clear of clouds. Our results are consistent with those obtained by other authors, using different methods, adding support to this value and proving the potential of the applied method. The clear conditions at the site are particularly good showing that San Pedro M\'artir is an excellent site for optical and infrared observations.
Avila Ricardo
Carraminana Alberto
Carrasco Eleazar
Cruz-Gonzalez Irene
Sánchez Leonardo J.
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