Further Studies on the Heat Radiation from The night sky at Poona

Abstract

The paper contains a discussion of the measurements of sky radiation made at the Central Agricultural meteorological Observatory with the help of Angstrom’s Pyrgeometer during 1945, 1946 and 1949. A study of the mean monthly variation of sky radiation shows that the sky radiation was minimum during winter and maximum during the cloudy monsoon period. Hourly variation of sky radiation during a few clear as well as cloudy nights has also been discussed in the paper. The values of atmospheric radiation measured in the evening and the succeeding morning on a few clear nights have been taken and the decrease in the radiation during the night has been compared with the change in radiation variation of  sky radiation may be accounted for by the variation in the radiation coming from the air layers nearest to the ground, which undergo nocturnal cooling. It has also been shown that the strength of inversion in the air layers near the ground increases as the net radiation increases.