The aureole technique is a method developed for estimating columnar optical and physical properties of atmospheric aerosols. It consists of measuring both direct solar irradiance and diffuse sky radiance by means of ground-based Sun-sky radiometers. Measurements are taken at different wavelengths in the UV-VIS-NIR bands, and selected within atmospheric windows in order to minimize the absorption of atmospheric gases (such as ozone, water vapor, NO2 or CO2)..

The direct solar irradiance is measured by pointing the sensor normal to the sun direct direction.

The sky radiance measurements are taken in two different geometries:


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