http://nopr.niscpr.res.in/handle/123456789/36653 Sun, 13 Sep 2026 01:59:35 GMT 2026-09-13T01:59:35Z http://nopr.niscpr.res.in/handle/123456789/36914 Title: Variation in the Upper Winds over Shar during Different Hours of the Day Authors: Rama, G V; Venkataraman, R Abstract: The wind profiles from surface to a height 10km were generated four times daily for seven days over Sriharikota and the data were analyzed by the technique of analysis of variance. There is no significant variation in the upper winds during the day except in the planetary boundary layer and at 5-6 km levels. Page(s): 252 Tue, 01 Dec 1981 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/36914 1981-12-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/36913 Title: Reflection of Ionosphere Potential Variations at a Land Station Authors: Mukku, Venkatnarayan Reddy; Khera, M K Abstract: Simple correlation analysis is done to show that the atmospheric electric field at a land station exhibits some response to the atmospheric electric field variations occurring over oceans, It is found that the variation in the potential gradient (PG) at a land station is due to both the change in the conductivity of the station and the PG over the oceans. Page(s): 250-251 Tue, 01 Dec 1981 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/36913 1981-12-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/36912 Title: Studies of Simultaneous Observation of Spread-F Occurrence on Oblique & Vertical Incidence Records Authors: Rao, P S Kesava; Naidu, P Appala Abstract: Results of simultaneous observation of spread-F irregularities on vertical and oblique incidence are presented, The vertical incidence data relate to Kakinada while the oblique incidence data relate to CW transmissions recorded from All India Radio, Hyderabad, at 4.8 MHz during 1800-2230hrs 1ST.Comparison of these data revealed that in a majority of the cases, there is no time delay in the spread-F occurrences on vertical and oblique incidence data indicating that the agency causing spread-F irregularities has an extent greater than 200 km in the east-west plane. Page(s): 248-249 Tue, 01 Dec 1981 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/36912 1981-12-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/36911 Title: Corrugated Flanged Horn Feed for Offset Paraboloidal Reflectors Authors: Pravinkumar, P A; Mohanan, P; Nair, K G Abstract: A technique for improving the coupling between a feed horn and reflector by using corrugated metallic flanges is presented. Experimental data for flanges of varying parameters are given and theoretical explanation is supplemented. Page(s): 246-247 Tue, 01 Dec 1981 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/36911 1981-12-01T00:00:00Z