P K Raman
Articles written in Proceedings – Section A
Volume 1 Issue 11 May 1935 pp 815-821
Volume 3 Issue 1 January 1936 pp 98-106
Volume 3 Issue 2 February 1936 pp 98-106
Volume 4 Issue 2 August 1936 pp 243-253
The paper discusses the results of measurements of nocturnal heat radiation received from the atmosphere at Poona and Sinhagad. The measurements were carried out in February and March 1935 with Angstrom pyrgeometers. Simultaneous measurements were made at the Agricultural Meteorological Observatory and the top of the tower of the Poona Meteorological Office and also from the latter and the top of Sinhagad, a hill 2,500 ft. above Poona level and distant 15 “ miles from Poona.
It is shown that on clear nights at all the three places there was a decrease of radiation from the atmosphere after sunset and that the decrease was a maximum at ground-level and minimum at Sinhagad. This decrease expressed as a fraction of the change in black body radiation corresponding to the change of temperature of the air near the instrument was on the average 0“47, but the ratio was smaller at lower levels than at higher. The results are discussed with reference to Angstrom’s formula for atmospheric radiation.
Volume 5 Issue 1 January 1937 pp 45-55
The hourly variation of the heat radiation coming from different altitudes of the night sky was measured on three nights in April and May 1936 with a Moll’s Micro-galvanometer anda Micro-thermopile provided with a small aperture. These observations show that the nocturnal cooling of the radiating air layers as shown by the decrease in the equivalent black body temperature of the sky is maximum for altitude zero (
The authors have great pleasure in thanking the Director-General of Observatories for providing necessary facilities for the investigation.
Volume 9 Issue 5 May 1939 pp 386-389
Volume 23 Issue 3 March 1946 pp 127-133