R P Singh
Articles written in Pramana – Journal of Physics
Volume 4 Issue 1 January 1975 pp 45-52 Solids
The electronic band structure of f.c.c. phase of the rare earth metal cerium (
Volume 30 Issue 3 March 1988 pp 217-223 Molecular Physics
The infrared and laser Raman spectra of 2, 3 dichloro aniline and 2, 6 dichloro aniline have been recorded. The vibrational spectra have been analysed assuming
Volume 53 Issue 3 September 1999 pp 425-429 Nuclear Structure And Dynamics
The lifetimes of the states of −ve parity 2-qp bands of
Volume 55 Issue 5-6 November 2000 pp 685-691 Space And Astrophysical Plasmas, Contributed Papers
The matched filtering technique is based on the digital-construction of theoretical whistlers and their comparison with observed whistlers. The parameters estimated from the theoretical and experimental whistler curves are matched to have higher accuracy using digital filters. This yields a resolution ten times better in the time domain. We have tested the applicability of this technique for the analysis of whistlers recorded at Varanasi. It is found that the whistlers have propagated along
Volume 55 Issue 5-6 November 2000 pp 699-705 Space And Astrophysical Plasmas, Contributed Papers
The amplitude scintillations of very high frequency electromagnetic wave transmitted from geo-stationary satellite at 244.168 MHz have been recorded at Varanasi (geom. lat. 14′ 55′N) during 1991 to 1999. The data are analyzed to determine the statistical features of overhead ionospheric plasma irregularities which are mostly of small duration <30 minutes and are predominant during pre-midnight period. The increase of solar activity generally increases the depth of scintillation. The auto-correlation functions and power spectra of scintillations predict that the scale length of these irregularities varies from 200–500 m having velocity of movement between 75 m/sec to 200 m/sec. These results agree well with the results obtained by other workers.
Volume 56 Issue 5 May 2001 pp 605-613 Research Articles
VLF emissions such as hiss, chorus, oscillating tones, hiss-triggered chorus and whistler triggered emissions have been observed at low latitude Indian stations. In this paper we present dynamic spectra of these emissions and discuss their various observed features. It is argued that most of the emissions are generated during Doppler shifted cyclotron resonance interaction between the whistler mode wave and counter streaming energetic electrons. Resonance energy of the participating electron and interaction length are evaluated to explain the generation mechanism of some of these emissions observed at Indian stations.
Volume 59 Issue 4 October 2002 pp 563-573 Review Article
The characteristic features of VLF hiss emissions during quiet and disturbed conditions observed at ground stations and on-board satellites are summarized. The increased intensity of the hiss emissions during magnetic storm period is explained by considering the enhanced flux of energetic electrons during magnetic storm period. The generation and propagation mechanism of VLF hiss are also briefly discussed.