IIAP Publications: Recent submissions

  • Effects of dust on the formation of lines in an expanding spherical medium 
    Peraiah, A; Varghese, B. A; Srinivasa Rao, M (The European Southern Observatory, 1987-06)
    A series of line profiles formed in a spherically symmetric and radially expanding atmosphere in which dust is present are computed, assuming that the dust scatters radiation isotropically. Two cases of dust distribution ...
  • Emission mechanism of extragalactic X-ray and radio sources 
    Krishan, V (Gordon and Breach Science Publishers, 1983)
    An alternative way of looking at the process of comptonization and the roles of the microwave background radiation density and of the ambient magnetic field in the generation of X-rays on the galactic scale is suggested. ...
  • Anomalous heating of quasar emission-line regions 
    Krishan, V (Royal Astronomical Society, 1987-06)
    It is shown that the non-thermal radio radiation from a quasar is intense enough to drive parametric instabilities in the fully ionized emission-line regions. These instabilities cause significant enhancement of the plasma ...
  • Duration of equatorial spread-F 
    Sastri, J. H (Copernicus Publications, 1984-06)
    From an analysis of ionogram data of Kodaikanal (dip 3.5 deg N) for a 3-yr period of high sunspot activity, it is shown that the duration of equatorial spread-F (ESF), on the average, bears a direct relationship to the ...
  • The He II line 4686 in WN binaries 
    Shylaja, B. S (Indian Academy of Sciences, 1987-06)
    The behaviour of the λ4686 line of He II in various WN binaries is studied for variations in total flux as well as radial velocities. It appears that the true motion of the WN component is not depicted by this line especially ...
  • Electromagnetic radiation in a helical magnetic field 
    Krishan, V (1984)
    Electromagnetic radiation spectrum is studied in a helical magnetic field since such magnetic field configurations may be present in cosmic objects. It is shown that, by a proper choice of the spatial period of the magnetic ...
  • Scattering of quasar radiation in intercloud plasma 
    Krishan, V (Royal Astronomical Society, 1988-09)
    Three different levels of description are available to describe the interaction of electromagnetic radiation with electrons in a fully ionized plasma: stimulated Raman scattering, stimulated Compton scattering, and Compton ...
  • Observations on the slowly varying component of solar radio emission at decameter wavelengths 
    Sastry, Ch. V; Shevgaonkar, R. K; Ramanuja, M. N (Springer, 1983-09)
    The authors have made two-dimensional maps of the slowly varying component (SVC) of solar radio emission at a frequency of 34.5 MHz with half power beam width of 26'/40'. It is found that a majority of SVC sources have ...
  • Response of equatorial electric field to polarity of interplanetary magnetic field 
    Sastri, J. H (Elsevier, 1989-11)
    The effect of the polarity of the interplanetary magnetic field, IMF, on the equatorial zonal electric field is assessed through a comparative study of the diurnal patterns of equatorial electrojet strength on days of ...
  • A study of the open cluster NGC 2374 
    Babu, G. S. D (Indian Academy of Sciences, 1985-03)
    The results of modified objective grating observations and photoelectric as well as photographic photometry of the open cluster NGC 2374 are presented. The cluster contains at least twenty stars as definite members down ...
  • Molecular applications of state-specific multireference perturbation theory to HF, H/sub2O, H/sub 2S, C/sub 2, and N/sub 2 molecules 
    Mahapatra, U. S; Chattopadhyay, S; Chaudhuri, R. K (American Institute of Physics, 2008-07)
    In view of the initial success of the complete active space (CAS) based size-extensive state-specific multireference perturbation theory (SS-MRPT) [J. Phys. Chem. A 103, 1822 (1999)] for relatively diverse yet simple ...
  • Disappearing solar filaments and geomagnetic activity 
    Sastri, J. H (Springer, 1986-05)
    As a sequel to the recent identification of the high-speed stream as the candidate structure in the solar wind at 1 AU that is primarily responsible for the geomagnetic disturbances occasionally noticed after 'disparition ...
  • Solar coronal rotation determined by X-ray bright points in Hinode/XRT and Yohkoh/SXT full-disc images 
    Kariyappa, R (EDP Sciences, 2008-09)
    Aims. Our aim is to identify and trace the X-ray bright points (XBPs) over the disc and use them as tracers to determine the coronal rotation. This investigation will help to clarify and understand several issues: (i) ...
  • General relativity of compact objects 
    Datta, B (Cambridge University Press, 1988-01)
  • Radio observations of the S0 galaxy NGC 1218 (3C 78) 
    Saikia, D. J; Subrahmanya, C. R; Patnaik, A. R; Unger, S. W; Cornwell, T. J; Graham, D. A; Prabhu, T. P (Royal Astronomical Society, 1986-04)
    The authors present VLA observations of the S0 galaxy NGC 1218 at λ20 and 6 cm with both the A and D arrays, at λ20 cm with the B array and at λ2 and 1.3 cm with the A array. They also present VLBI observations at λ6 cm ...
  • Spectrophotometry of Comet P/Halley. I - Flux, column density and emission gradients within the coma in the emission bands and the continuum 
    Sivaraman, K. R; Babu, G. S. D; Shylaja, B. S; Rajamohan, R (European Southern Observatory, 1987-11)
    The authors made spectral scans of comet P/Halley using the scanner at the Cassegrain focus (f/13) of the 102 cm reflector at Kavalur. The scans cover generally the wavelength region from 3900 to 6200 Å and are at 40 Å ...
  • On the dynamical evolution of a spheroidal cluster. II - Anisotropic velocity distribution 
    Sunder, G. S; Kochhar, R. K (Royal Astronomical Society, 1986-08)
    The dynamical evolution of a spheroidal cluster of point masses is investigated theoretically, extending the analysis of Som Sunder and Kochhar (1985) by removing the assumption of locally isotropic velocity. The basic ...
  • Frequency shifts and line broadening of radiation from rotating neutron stars 
    Kapoor, R. C; Datta, B (The Royal Astronomical Society, 1984-08)
    The frequency shifts and line broadening of radiation from the surface of rapidly rotating neutron stars are calculated using a rotationally perturbed interior spherical metric and a representative choice of the equation ...
  • Sunspots Data Analysis Using Time Series 
    Shaikh, Y. H; Khan, A. R; Iqbal, M. I; Behere, S. H; Bagare, S. P (World Scientific Publishing, 2008-09)
    The record of the sunspot number visible on the sun is regularly collected over the centuries by various observatories for studying the different factors influencing the sunspot cycle and solar activity. Sunspots appear ...
  • Spectrophotometric studies of CO Cephei 
    Shylaja, B. S (Indian Academy of Sciences, 1986-09)
    Spectrophotometric and spectroscopic observations of CQ Cep, the shortest-period binary with a WN component, are presented. Excepting the N V 4603 A, the fluxes of all other emission lines show enhancement at minima. They ...

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