Determination of Ångström's turbidity coefficient from direct total solar irradiance measurements

摘要: Abstract A method of determining Angstrom's turbidity coefficient from the measured total (broadband) direct normal solar irradiance is described here. This can be expressed in terms individual transmittances various atmospheric attenuators, such as ozone layer thickness, precipitable water vapor and α β formula. From resulting parameterization equation, an explicit expression for obtained. By assigning a fixed value to α, determined. Use this demonstrated with data Ajaccio (France), mediterranean coastal station.