Aerospace Instrument-Making Annotation << Back About one generalization of the Bouguer – Beer law. The calibration possibility of ground-based solar photometers using invariant parameter of solar spectral irradiation. H.H. Asadov, E.S. Abbaszadeh, Sh.T. Suleymanov, I.M. Mirzabalayev The possibility of the invariant parameter forming of the solar spectral irradiation obtained as a result of the generalization of the Bouguer – Beer law for three-wavelength method of measurement is considered. It is shown, that the calibration of the three-wavelength photometers by proposed invariant eliminates influence of atmosphere parameters unsteadiness along the wavelength.