http://nopr.niscpr.res.in/handle/123456789/37380 2026-10-12T21:28:58Z http://nopr.niscpr.res.in/handle/123456789/37717 Title: Frequency of the Received Wave from a Geostationary Satellite Authors: Agarwal, D. C. Abstract: This communication deals with the calculations of shift in frequency received on earth from a geostationary satellite, caused by relative motion between earth and satellite and the gravitational field of the earth. It is found that total shift is of the order of Δ<i>f/f_s. </i> = 5.50 x 10^-10 which needs experimental verification. Page(s): 230-232 1975-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/37716 Title: A New Method for Estimation of the Neutral Temperature in the Upper Atmosphere by Night Airglow Measurements Authors: Majmudar, Nita H.; Kulkarni, P. V. Abstract: The ratio of intensity of one of the rotational lines in <i>P </i> branch to the total intensity of the <i>R </i> branch of a rotational vibrational band is shown to give' the temperature of the emission region. In the OH (7-2) band, intensity of (i) <i>P₁ (3) </i>line, λ = 6922.8 Ǻ and (ii) Total <i>R </i> branch, λ = 6832 Ǻ is measured with the help of a photoelectric filter photometer with two narrow band filters. A third filter at 7115 Ǻ allows background measurements. Ratio of intensities of <i>P₁ </i> (3) to total <i>R </i> branch is computed and compared with that calculated theoretically. The comparison gives the temperature. Preliminary results are presented. Page(s): 228-230 1975-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/37715 Title: Nighttime Pi2 Micropulsations at Kodaikanal Authors: Sastri, J. Hanumath; Murthy, B. Suryanarayana Abstract: The occurrence characteristic of nighttime Pi2 micropulsations at Kodaikanal (geogr. lat: 10^ᵒ 14' N; dip: 3·5^ᵒN) is studied from normal run magnetogram data for a 1-yr period from January to December 1973. It is noticed that the occurrence of Pi2 pulsations is a broad maximum around local midnight. The dependence of the occurrence of Pi2 pulsations on magnetic activity is of composite nature in that the occurrence is positively correlated with <i>K_p </i>index in the range 0⁺ to 2, and negatively correlated with <i>K_p </i>index in the range 2 to 5. Page(s): 227-228 1975-09-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/37714 Title: Geomagnetic Solar Flare Effect in the Dark Hemisphere Authors: Sastri, J. Hanumath Abstract: Evidence is presented from normal run magnetogram data of Huancayo, Kodaikanal and Kakioka to show that geomagnetic solar flare effect (SFE or Crochet, occurs not only in the sunlit hemisphere but also in dark hemisphe reo Using a selected sample of five events observed over the period 1969-71, it is noticed that discrepancy exists between the observed characteristics of nighttime geomagnetic SFE and those expected from the interpretation that the nighttime geomagnetic SFE is due to induced currents that are forced to flow into the ,dark. hemisphere owing to the sudden increase in electrical conductivity of the sunlit hemisphere. This discrepancy may be due to some of the inherent assumptions of the theoretical model used .for calculating the characteristics of induced currents in the dark hemisphere. Page(s): 225-227 1975-09-01T00:00:00Z