沖縄県宮古島における雲と天空紅斑紫外放射照度·輝度変化に関する研究

摘要

雲一つ無い快晴より一部に雲が有った方が、紫外放射照度が増加することがEstupinan、Crawford，髙野、垂水らによって報告されて いる。Estupinanは雲による日射と紫外放射の減衰及び增加を述べ ,Crawfordは天空魚眼写真と紫外放射照度を時系列で並べ，快晴時より雲が出現した方が、紫外放射照度が増加する様子を記している。垂水は金沢における紫外放射測定から、"雲の全く無い晴天時 よりも多少の雲や上層雲が出現している方が反射等の影響により地上到達紫外線量が増大する"と推察している。%Ultraviolet radiation may cause the skin damage. In order to protect skin from harm, it is necessary to know sky ultraviolet problems that cloud condition may happen to change in a few minute during measuring. New measuring equipment for radiance distribution of sky erythema ultraviolet radiation was developed It was an electronic scanning method and is equipped with 145 sensors of erythema ultraviolet radiation Therefore, it has become possible to measure the radiance distribution at only three seconds. This research aims to measure erythema ultraviolet radiance distribution under broken cloud sky condition using this measuring equipment As results, it was clarified ultraviolet radiation from broken cloud sky is sometimes higher than one from clear sky.