NOPR Collection:

Need for development of tethered balloon facility for basic studies of Indian summer monsoon

2016-10-26T07:09:06Z

Title: Need for development of tethered balloon facility for basic studies of Indian summer monsoon Authors: Rama Abstract: Major part of the easily precipitable moisture in the S-W monsoon air mass originates from evaporation over the Arabian Sea and its subsequent up[ward transport by vertical mixing. It is commonly thought that vertical mixing in the air mass, particularly over the East Arabian Sea, is vitally important for rainfall activity over the west coast. A programme for assessing this vertical mixing should therefore be very valuable for understanding the dynamics of the monsoon from measurement of vertical profiles of radon in the air mass. The most practical method for measuring radon in high altitude air, at present, requires bringing about 20 litres sample of this air to the laboratory. This can be best done using tethered balloons which can carry the samplers to the desired altitudes and then bring them back filled with the desired samples of air. In addition to procuring samples of high altitude air for radon measurements, same balloons may be used for obtaining better and more detailed conventional meteorological data than hitherto available. Page(s): 316-318

Structure and growth of atmospheric boundary layer as observed by a tethered balloon payload

2016-10-26T07:07:56Z

Title: Structure and growth of atmospheric boundary layer as observed by a tethered balloon payload Authors: Vernekar, K G; Sadani, L K; Mohan, Brij; Saxena, Sangeeta; Debaje, S B; PiIlai, J S; Murthy, B S; Patil, M N Abstract: Temperature, humidity, pressure, horizontal wind speed and its direction were measured by a tethered balloon (kytoon)-bome payload at the Central Agricultural Meteorological Observatory (CAMO), Pune, during 22 Feb. 1989-2 Mar. 1989 to study the evolution of atmospheric boundary layer and its other properties up to 1000 m. On an average 8-9 kytoon flights per day were arranged. The data collected on the above flights are analysed to study (i) the rise of inversion layer, (ii) transformation of stable boundary layer into thoroughly mixed layer, and (iii) temporal variation of mixing ratio. Page(s): 312-315

Microwave balloon measurements of the stratospheric temperature

2016-10-26T07:05:15Z

Title: Microwave balloon measurements of the stratospheric temperature Authors: Vlasov, A A; Kadygrov, E N; Sorokin, M G Abstract: The results of balloon flight with nadir microwave thermal sounding launched on 25 July 1990 from Rylsk base are presented. Radiometer without image rejection operating at the slopes of 9⁺ and 11^- oxygen resonance lines and having 6 channels with bands of 3-150 MHz and sensitivities of 0.6-0.09 K has been used. Page(s): 310-311

Height profile of vertical electric field and conductivity over Hyderabad

2016-10-26T07:03:16Z

Title: Height profile of vertical electric field and conductivity over Hyderabad Authors: Udare, R S; Rajaram, R; Ogawa, T; Yashuhara, M Abstract: The results of vertical electric field and conductivity measurements carried out in the 17 to 32 kin range on two balloon flights from Hyderabad are presented. These experiments could be flown in the 'piggyback' mode as the payloads were passive and did not require any telemetry support. Electric fields and conductivities were monitored by measuring potential difference between two 10 m long vertical steel wire antennas by a very high (switchable) input impedance amplifier. The height dependence of electric fields and conductivities could be represented as exponentials with scale height of approximately 10 km. There were no significant differences in electric fields, though the flights were conducted in different seasons. The conductivity values, which increased exponentially with height, were, however, higher in the winter flight than in the equinoxial flight. Page(s): 307-309