On a Relation between the Distribution of Ultraviolet Sky Radiation and the Optical Thickness of the Atmosphere

[摘要] With the numerical calculation of the theoretical formula of primary and secondary Rayleigh scattering in a plane-stratified atmosphere of uniform composition, an ifluence of variation of total scattering coefficient of the atmosphere on the angular distribution of the intensity of ultraviolet sky radiation in the sun's vertical plane was discussed, when the sun's elevation angle was 30° and 60° respectively.Taking the intensity at the zenith as a unit, the relative intensities from varying zenith angle were computed and were computed and were compared with the observed values of C. Dorno and F. Lindholm or O. Eckel which were obtained at the position of varying elevation from sea level. The theory shows that the relative intensities at a comparatively large zenith angle especially at 60° always increase with decreasing optical thickness of the atmosphere and these were confirmed by the observed results at both of the sun's elevation angles.

[学科分类] 大气科学