IIAP Publications: Recent submissions

  • Dynamics of the Solar Magnetic Network: Two-dimensional MHD Simulations 
    Hasan, S. S; van Ballegooijen, A. A; Kalkofen, W; Steiner, O (The American Astronomical Society, 2005-10)
    The aim of this work is to identify the physical processes that occur in the network and contribute to its dynamics and heating. We model the network as consisting of individual flux tubes, each with a nonpotential field ...
  • Application of relativistic coupled-cluster theory to heavy atomic systems with strongly interacting configurations: Hyperfine interactions in 207Pb+ 
    Sahoo, B. K; Chaudhuri, R. K; Das, B. P; Merlitz, H; Mukherjee, D (The American Physical Society, 2005-09)
    We report the results of our calculations of the magnetic dipole hyperfine constants for the ground and low-lying excited states of Pb+ using the relativistic coupled-cluster theory. The spectacular role of correlation ...
  • Pixel size and pitch measurements of liquid crystal 
    Banyal, R. K; Prasad, B. R (Indian Academy of Sciences, 2005-08)
    We present a simple technique for the determination of pixel size and pitch of liquid crystal (LC) based spatial light modulator (SLM). The proposed method is based on optical diffraction from pixelated LC panel that has ...
  • High-contrast, all-optical switching in bacteriorhodopsin films 
    Banyal, R. K; Prasad, B. R (Optical Society of America, 2005-09)
    We report experiments with nonlinear-absorption-based, high-contrast, all-optical switching in photochromic bacteriorhodopsin (BR) films. The switching action is accomplished by control of the transmission of a weak probe ...
  • Quadratic Padé approximants and the intruder state problem of multireference perturbation methods 
    Perrine, T. M; Chaudhuri, R. K; Freed, K. F (John Wiley & Sons, Inc., 2005-10)
    Simple and quadratic Padé resummation methods are applied to high-order series from multireference many-body perturbation theory (MR-MBPT) calculations using various partitioning schemes (Møller-Plesset, Epstein-Nesbet, ...
  • High Resolution Stellar Spectroscopy with VBT Echelle Spectrometer 
    Kameswara Rao, N; Sriram, S; Jayakumar, K; Gabriel, F (Indian Academy of Sciences, 2005-09)
    The optical design and performance of the recently commissioned fiber fed echelle spectrometer of 2.34 meter Vainu Bappu Telescope are described. The use of it for stellar spectroscopic studies is discussed.
  • Long-Term Variations in Solar Differential Rotation and Sunspot Activity 
    Javaraiah, J; Bertello, L; Ulrich, R. K (Springer, 2005-12)
    The solar equatorial rotation rate, determined from sunspot group data during the period 1879 2004, decreased over the last century, whereas the level of activity has increased considerably. The latitude gradient term of ...
  • Ab initio calculation of P,T-odd effects in YbF molecule 
    Nayak, M; Chaudhuri, R. K (Elsevier, 2006-02)
    A fully-relativistic restricted active space (RAS) configuration interaction (CI) approach is employed to compute the P,T-odd interaction constant Wd of the ground (2Σ) state of YbF. A series of increasingly sophisticated ...
  • Variation of Rayleigh wave group velocity dispersion and seismic heterogeneity of the Indian crust and uppermost mantle 
    Mitra, S; Priestley, K; Gaur, V. K; Rai, S. S; Haines, J (Blackwell Publishing, 2006-01)
    We present group velocity dispersion results from a study of regional fundamental mode Rayleigh waves propagating across the Indian region. 1-D, path-averaged dispersion measurements have been made for 1001 source-receiver ...
  • Near-simultaneous Spectroscopic and Broadband Polarimetric Observations of BE Stars 
    Ghosh, K; Iyengar, K. V. K; Ramsey, B. D; Austin, R. A (The American Astronomical Society, 1999-08)
    Near simultaneous optical spectroscopic (on four nights) and broadband linear continuum (B, V, R,and I bands) polarimetric (on seven nights) observations of 29 Be stars were carried out during 1993November-December. The ...
  • A Variational Calculation of Light Hypernuclei 
    Panda, P. K; Sahu, R (World Scientific Publishing Company, 1999-06)
    A nonperturbative variational calculation has been made for the s-shell hypernuclei. Here we dress the Λ- and Σ0- hypernuclei with off-mass shell pion pairs. The analysis replaces the scalar isoscalar potential by quantum ...
  • Comparative morphology of EIT/SOHO images and HeII excitation 
    Venkatakrishnan, P (Kluwer Academic Publishers, 1999-06)
    Morphological differences between coronal images on the one hand, and a Hei image on the other, are used to demonstrate the independence of Heii excitation from coronal radiation. The distribution of magnetic flux is found ...
  • Identification of AlF Molecular Lines in Sunspot Umbral Spectra 
    Bagare, S. P; Balachandra Kumar, K; Rajamanickam, N (Springer, 2006-03)
    High resolution FTS sunspot umbral spectra from NSO/Kitt Peak were used to detect rotational lines due to 11 electronic transitions of the molecule AlF, in the wavelength region 4400 9000 Å. The presence of lines due to ...
  • Principles of Invariance in Radiative Transfer 
    Peraiah, A (Kluwer Academic Publishers, 1999-01)
    We have reviewed the principle of invariance, its applications and its usefulness for obtaining the radiation field in semi-infinite and finite atmospheres. Various laws of scattering in dispersive media and the consequent ...
  • Spectroscopy of the post-AGB star HD 101584 (IRAS 11385-5517) 
    Sivarani, T; Parthasarathy, M; García-Lario, P; Manchado, A; Pottasch, S. R (The European Southern Observatory, 1999-06)
    From an analysis of the spectrum (4000 Ä to 8800 Ä) of HD 101584 it is found that most of the neutral and single ionized metallic lines are in emission. The forbidden emission lines of [OI] 6300 Ä and 6363 Ä and [CI] 8727 ...
  • Hall-MHD Turbulence in the Solar Wind 
    Krishan, V; Mahajan, S. M (The Royal Swedish Academy of Sciences, 2005)
    The solar wind is a great paradigm for investigating magnetohydrodynamic turbulence. It is shown that the frame work of Hall magnetohydrodynamics (HMHD), which can support three quadratic invariants and allows nonlinear ...
  • Emission Altitude from Relativistic Phase Shift Due to Plasma Corotation in Pulsars 
    Gangadhara, R. T (The Royal Swedish Academy of Sciences, 2006)
    The radio emission from a relativistic plasma in a pulsar magnetosphere experiences a relativistic phase shift due to spin and difference in the emission altitude. Using the single pulse data of PSR B0329 + 54 at 325 MHz ...
  • Density and Temperature Diagnostics of Solar Emission Lines from NeV/MgV and SiVII/MgVII Ions 
    Mohan, A; Dwivedi, B. N; Raju, P. K (Indian Academy of Sciences, 1999-06)
    We present NeV/ MgV and SiVII/MgVII theoretical line intensity ratios as a function of electron density Ne and temperature Te. These are shown in the form of ratio-ratio diagrams, which should in principle allow both Ne ...
  • Propagation effects on polarization of pulsar radio emission 
    Gangadhara, R. T; Lesch, H; Krishan, V (The Royal Astronomical Society, 1999-08)
    We consider the role of a propagation effect such as stimulated Raman scattering on the polarization of radio pulses. When an intense electromagnetic wave with frequency close to the plasma frequency interacts with the ...
  • Probing the internal magnetic field of slowly pulsating B-stars through g modes 
    Hasan, S. S; Zahn, J. P; Christensen-Dalsgaard, J (EDP Sciences, 2005-12)
    Context: . Aims: .We suggest that high-order g modes can be used as a probe of the internal magnetic field of SPB (slowly pulsating B) stars. The idea is based on earlier work by the authors hich analytically investigated ...

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