Articles written in Proceedings – Section A
Volume 15 Issue 1 January 1942 pp 52-63
The paper deals with the results of a spectroscopic investigation of the fluorescence, absorption and scattering of light in ruby. The first order lattice spectrum of alumina is shown to possess eighteen normal modes of vibrations. Two Raman lines having frequency shifts of 376 and 412 cm.−1 have been obtained with a single crystal of alumina. The fluorescence and absorption spectra of ruby have been recorded using specially sensitized infra-red plates to register the bands in the long wavelength region with good intensity. The polarisation characters of the bands have also been studied with reference to the direction of the optic axis of the crystal and the direction of polarisation of the incident beam. From a perusal of the results, the emission bands have been divided into two groups
Volume 19 Issue 5 May 1944 pp 231-252
Volume 20 Issue 3 September 1944 pp 117-121
Volume 20 Issue 3 September 1944 pp 155-161
Volume 20 Issue 6 December 1944 pp 323-328
Volume 21 Issue 6 June 1945 pp 280-287
Volume 61 Issue 5 May 1965 pp 322-334
Atmospheric electricity measurements made during the last decade at Poona using balloon-borne sondes are briefly reviewed. The vertical distribution of potential gradient in the free atmosphere follows theoretical values only during the monsoon months, when the air is comparatively free from dust. During the summer months, the potential gradient is constant above the exchange layer and this is associated with the presence of the deep, dense dust layer that lies over the region and extends to over 10 km. into the atmosphere. The increase with height of the potential gradient above the 10 km. level during winter is shown to be closely related to the presence of the subtropical jet stream, which presumably transports electric charges to the upper levels over Poona.
Volume 64 Issue 1 July 1966 pp 1-8
The paper describes a new radiosonde developed at Poona for high altitude balloon soundings and the results of the high level radiosonde ascents taken at Hyderabad as part of the Indo-US Balloon Flight Programme—1961. The temperature data obtained during the programme are presented and compared with the results of the sounding balloon ascents made over Poona and Hyderabad during 1928–35.