Abstract
The circumsolar radiance and irradiance is discussed taking into account all relevant optical parameters. The decrease of the radiance from the limb of the sun to an angular distance of 10° from the sun's center is mainly determined by the optical depth of the atmosphere and the size distribution of scattering particles. Thin cirrus clouds have the strongest effect. In this case the radiance at 0.5° angular distance may reach about 2 per cent of the radiance of the direct sun. In the case of aerosol scattering alone, the radiance at 0.5° does not reach more than 0.1 per cent. Therefore a field of view larger than the angular size of the sun only gives rise to a significant increase in the total (solar plus circumsolar) irradiance if a thin cirrus layer is present.
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