http://nopr.niscpr.res.in/handle/123456789/37372 2026-10-09T16:33:53Z http://nopr.niscpr.res.in/handle/123456789/37640 Title: Secondary Maxima in Total Electron Content over Hawaii Authors: Prakash, Sant Abstract: An observation of the secondary maxima occurrences over Hawaii both at daytime and nighttime has been made using electron content versus time data. These data were obtained over Hawaii by measuring Faraday rotation of the polarization of vhf telemetry carrier transmissions from the geostationary satellite. The occurrence of secondary maxima is more pronounced during winter than in any other season and also during nighttime than daytime. Page(s): 336-337 1976-12-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/37639 Title: Microwave Absorption in the Martian Atmosphere Authors: Johri, Rakesh K; Joshi, Jagdish C Abstract: Microwave absorption in the Martian atmosphere (in the frequency range 21-117 GHz) from 0 to 185 km, has been computed. The total absorption coefficient ϒ, absorption coefficient at peak resonance frequency ϒ₀, and half-width of the absorption line Δ<i>v</i> are calculated for all the important constituents of the Martian atmosphere. A comparison of the ϒ₀and Δ<i>v</i> values for the Martian and terrestrial atmospheres indicater that the ϒ₀ values are greater for Martian atmosphere, while reverse is true for Δ<i>v</i> values. Page(s): 332-336 1976-12-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/37637 Title: Forbush Decrease & Geomagnetic Storms in relation to Varying Interplanetary Parameters Authors: Agrawal, S P; Singh, R L Abstract: Using the hourly neutron monitor data for the present solar cycle, the characteristics of all the Forbush decreases (FDs) have been studied. Statistically, the rigidity spectral exponent is found to be <img src='/image/spc_char/wave.gif' border=0> 0·8 ± 0·2. It is seen that most of the FDs occur in coincidence with sudden storm commencements and the largest FDs are produced by solar flares occurring near the central meridian. These results are discussed in terms of earlier observations. Page(s): 330-332 1976-12-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/37635 Title: Anomalous Variations in F-Region Phase Path Records Authors: Murthy, B Suryanarayana; Rao, B Ramachandra Abstract: Some peculiar complexities observed in F-region phase path records, taken on a frequency of 5'6 MHz, during daytime at Waltair, are presented. These complexities are discussed in terms of reflections coming from curved surfaces produced by travelling ionospheric disturbances in the ionosphere. Page(s): 328-329 1976-12-01T00:00:00Z