Atmospheric extinction is the astronomical parameter that evaluates sky transparency. Sources of sky transparency degradation are clouds (water vapor) and aerosols (dust particles included).
Atmospheric extinction is a relevant to ground-based astronomy in optical and near-infrared wavelengths since it is associated with the absorption/scattering of incoming photons from astronomical sources by the Earth’s atmosphere
The Observatorio del Roque de los Muchachos (ORM), in the Canary Islands (Spain), was one of the candidates to host the future European Extremely Large Telescope (E-ELT) and is the site of the Gran Telescopio Canarias (GTC), the largest optical infrared facility to date. Sky transparency is a key parameter as it defines the quality of the
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The report concludes that the Canary Islands observatories (Roque de los Muchachos and Teide; ORM and OT) show an extremely clean air and pristine skies, only partially affected by some dust loaded
