R V Bhonsle
Articles written in Proceedings – Section A
Volume 43 Issue 5 May 1956 pp 306-308
Volume 43 Issue 6 June 1956 pp 400-400 Erratum
Volume 51 Issue 4 April 1960 pp 189-201
The paper describes observations made at Ahmedabad of sudden cosmic noise absorptions (SCNA’s) on 25 Mc./s. associated with solar flares. The frequency distributions of solar flare attenuations, their times of growth and duration, etc., have been determined and the results are compared with similar observations made by other workers. It has been found that SCNA’s of 25 Mc./s. recorded at Ahmedabad in 1956–58 have been markedly larger in size and duration than those observed in Australia on 18·3 Mc./s. in 1950–51.
Volume 74 Issue 3 September 1971 pp 142-151
A Dicke-type microwave radiometer has been developed for daily measurement of solar flux at 2800 MHz. The antenna system, consists of a 5 foot parabolic dish with horn feed, is equatorially mounted and is capable of tracking the sun for about 8 hours each day. The dynamic range of the radiometer is such that even strong solar bursts (flux = 10,000 × 10−22 Watts m−2 Hz−1) can be recorded by using the receiver in the AGC mode.
The calibration procedure and the errors involved in the measurement of the solar flux are briefly discussed. Some sample records of solar bursts made by means of this equipment are presented.