Papers in Meteorology and Geophysics
Online ISSN : 1880-6643
Print ISSN : 0031-126X
ISSN-L : 0031-126X
Studies of the Distribution of Ultraviolet Sky Radiation (V) - On the Optical Thickness of the Atmosphere -
K. Sekihara
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1953 Volume 3 Issue 4 Pages 277-285

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Abstract

With the numerical calculation of the theoretical formula of primary and secondary scattering obtained in the second paper of this series with varying coefficient of extinction, the effect of the optical thickness of the atmosphere on the distribution in the sun's vertical plane was discussed when the sun's elevation angle was 60° and 30°.
The result of calculation shows that the contribution of seco nciary scattering increases with an increasing value of scattering coefficient.
Taking the intensity at the zenith as a unit the relative intensities at various zenith angles were compared and were com pared with the observed values of C. DORNO and F. LINDHOLM or O. ECKEL which were obtained at positions of various elevation above sea level. The theory shows that the relativeinten sities at, a comparatively large zenith angle especially at 60° always increases with decreasing optical thickness of the atmo s phere and this was confirmed by the observed results qualitatively at both of the two elevation angles of the sun. The anomalous large value of the relative intensity at the zenith angle of 60°observed by C. DORNO and F. LINDHOLM at the sun's elevation of 30° at Muottas Muraigl (2450 m) and also that observed by O. ECKEL at Gmunden (430 m) at the sun's elevation of 60° when Föhn-weather prevailed were pointed out. As a possible cause of this anomaly the influence of ozone absorption which spreads downward and then decreases the scattering layer was suggested.

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© by Japan Meteorological Agency / Meteorological Research Institute
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