IIAP Publications: Recent submissions

  • One-third spectrum in large scale Hall-magnetohydrodynamic turbulence 
    Krishan, V; Mahajan, S. M (American Institute of Physics, 2004-11)
    In a recent study [H. Branover, A. Eidelman, and E. Golbraikh, ``On the universality of large-scale turbulence,'' Phys. Fluids 16, 845 (2004)] the properties of the large scale turbulence have been investigated theoretically ...
  • Electronic structure of the calcium monohydroxide radical 
    Taylor, C. M; Chaudhuri, R. K; Freed, K. F (American Institute of Physics, 2005-01)
    Effective valence shell Hamiltonian H/supv calculations are used to map out three-dimensional potential energy surfaces for the 12 lowest electronic states of the CaOH radical. Excitation energies and spectroscopic constants ...
  • Radiative transfer effects in rotationally distorted stars 
    Srinivasa Rao, M (Royal Astronomical Society, 2005-03)
    A general expression for the gravity darkening of the tidally and non-uniformly rotating Roche components of close binary systems is used to calculate the uniform rotational effects on line profiles in an expanding atmosphere. ...
  • Implications of Tension-Free Equilibria for Pre-Flare Energy Build UP 
    Venkatakrishnan, P (International Astronomical Union, 1990)
    The downward tension force is known to be the extremely small at the locations of highly sheared magnetic fields. The free energy in such tension free fields is shown to be dependent on the plasma density. The excess of ...
  • BVR photometry of a newly identified RS CVn binary star HD 61396 
    Barway, Sudhanshu; Pandey, S. K; Parihar, P. S (Elsevier, 2004-12)
    BVR photometry of a recently identified RS CVn binary star HD 61396, carried out during 2001, is presented. The new photometry reveal significant evolution in the shape and amplitude of light curve when compared with those ...
  • Abundances in planetary nebulae: NGC 6886 
    Pottasch, S. R; Surendiranath, R (EDP Sciences, 2005-03)
    ISO and IUE spectra of the round-shaped planetary nebula NGC 6886 are combined with spectra in the visual wavelength region taken from the literature to obtain a complete, extinction corrected spectrum from ultraviolet to ...
  • Magnetic Shear and Flares 
    Venkatakrishnan, P (International Astronomical Union, 1990)
    Magnetic tension possesses low values at regions of large magnetic “shear” on the polarity inversion line. The low tension allows for a non-force-free field that depends on the density may then possibly evolve into solar ...
  • Polarization Measurements of Some Herbig Ae / Be-Stars 
    Jain, S. K; Bhatt, H. C; Sagar, R (International Astronomical Union, 1990)
    We have measured the linear polarization of 8 bright Herbing Ae/ Be starsin UBVRI bands. No unique wavelength dependence of magnitude as well as direction is found on these measurements.
  • Franck-Condon factors and r-centroids for certain band systems of astrophysical molecules SrF and ScF 
    Ramachandran, P. S; Rajamanickam, N; Bagare, S. P; Kumar, B. C (Springer, 2005-01)
    The Franck-Condon factors and r-centroids, which are very closely related to vibrational transition probabilities, have been evaluated by the more reliable numerical integration procedure for the bands of B 2∑+ X 2∑+, F ...
  • Spectroscopic study of stars with dusty disks 
    Sivarani, T; Parthasarathy, M (2004)
    We have selected several stars with far-IR (IRAS)fluxes indicating the presence of circumstellar dust shells and disks. In this paper we present an analysis of the spectra of these stars. In several of these stars we find ...
  • Global Evolution of Photospheric Magnetic Fields 
    Makarov, V. I; Sivaraman, K. R (International Astronomical Union, 1990)
    The main feature concerning the evolution of the large photospheric magnetic fields derived from synoptic maps as well as from H –alpha synoptic charts are reviewed. The significance of a verity of observations that indicate ...
  • Self-organization processes on the sun - The heliosynergetics 
    Krishan, V; Mogilevskij, E. I (International Astronomical Union, 1990)
    A study by Levich and Tzvetkov (1985) is used to construct a model of solar granulation in its entirety. Solar granulation on all scales and the formation and evolution of some structures in active solar regions are ...
  • Interpretation of the 'third harmonic' of the solar magnetic cycle 
    Gokhale, M. H; Javaraiah, J (International Astronomical Union, 1990)
    The behavior and significance of a third harmonic peak at about 3/22/y which is present in the spectra of all the odd degree axisymmetric modes with respect to the temporal frequency are investigated. The correlation between ...
  • Classification of Magnetoatmospheric Modes in Sunspot Umbrae 
    Hasan, S. S; Sobouti, Y (International Astronomical Union, 1990)
    We examine the wave modes in a sunspot umbra. Assuming stratification, based on a model atmosphere in a sunspot, the normal mode spectrum is determined. The modes are classified using a scheme based on a Helmholtz decomposition ...
  • Spin-Dependence of Meson Production in NN Collisions 
    Deepak, P. N; Hanhart, C; Ramachandran, G; Vidya, M. S (World Scientific Publishing Company, 2005-01)
    We present here a model-independent irreducible tensor approach to meson production in NN collisions, which leads to a spin-structure of the T-matrix valid at all energies together with exact partial-wave expansions for ...
  • Radiative transfer with Compton scattering in spherically symmetric shells 
    Peraiah, A; Varghese, B. A (Astronomical Society of Japan, 1990)
    The radiative transfer equation with Compton scattering is solved for spherically symmetric shells. The purpose of the study is to determine how gamma rays or X-rays change their energies and how they become reflected and ...
  • Modeling of short scale turbulence in the solar wind 
    Krishan, V; Mahajan, S. M (European Geosciences Union, 2005-01)
    The solar wind serves as a laboratory for investigating magnetohydrodynamic turbulence under conditions irreproducible on the terra firma. Here we show that the frame work of Hall magnetohydrodynamics (HMHD), which can ...
  • Sunspot motions from a study of Kodaikanal and Mount Wilson observations 
    Howard, R. F; Sivaraman, K. R; Gupta, S. S; Gilman, P. I (International Astronomical Union, 1990)
    Results are presented of a study of the daily motions of individual sunspots and of sunspot groups on the basis of Kodaikanal and Mount Wilson white-light observations. A comparison of the two data sets show a good agreement ...
  • Exact solution of the incompressible Hall magnetohydrodynamics 
    Mahajan, S. M; Krishan, V (Royal Astronomical Society, 2005-05)
    The Alfvén wave is known to be an exact solution of the ideal magnetohydrodynamics (MHD), and this has found use in modelling astrophysical turbulence. In this paper we show that the Hall MHD also submits itself to an exact ...
  • Estimates of precipitable water vapour from GPS data over the Indian subcontinent 
    Jade, S; Vijayan, M. S. M; Gaur, V. K; Prabhu, T. P; Sahu, S. C (Elsevier, 2005-04)
    Water vapour plays a dominant role in the high-energy thermodynamics of the atmosphere, notably, the genesis of storm systems. However, its distribution is difficult to resolve by conventional means, since water vapour ...

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