关键词: 紫外总辐射, 紫外直接辐射, 散射辐射, 太阳紫外辐射, 天气条件, 中国地区, 通量, 积分散射, 日总量, 云量

Abstract: (1) The energy flux of the ultraviolet direct radiation S_△ for the wavelength range between 0.3-0.4μ may be written by Where I_0λ is the spectral irradiance outside the atmosphere at the wavelength λ, and τ_1λ; τ_2λ and τ_3λ are the optical depths for molecular scatting under normal sea-level pressure, absorpti on by ozone, and aerosol extinction at λ above the stations respectively.