Solar Radiation Measurements at the Fonovaya Observatory: Part II: Results from 2021 Measurements

Ground-based measurements at the Fonovaya Observatory in 2021 are used to analyze the variations in solar radiation in the wavelength ranges 0.285–2.8, 0.280–0.400, and 0.280–0.315 μm. The calculations of the radiation balance and albedo of the underlying surface are presented. The diurnal radiation balance is shown to be −1.20 ± 1.18 MJ/m 2 during the period of stable snow cover, from November to March, and +8.83 ± 4.49 MJ/m 2 in the snow-free period, from May to September. The diurnal solar radiation absorption by the Earth’s surface is estimated to not exceed 2 MJ/m 2 during the period of stable snow cover, from December to March, and to vary from 10 to 25 MJ/m 2 in summer.