IIAP Publications: Recent submissions

  • Ab initio description of the ground and excited states of cyanogen isomers 
    Chaudhuri, R. K; Krishnamachari, S. L. N. G; Freed, K. F (Elsevier, 2006-08)
    Ab initio calculations are used to characterize the ground and low lying excited electronic states of several linear and cyclic isomers of cyanogen. In particular, the calculations consider the excitation energies for ...
  • Evaluation of astrophysically useful parameters for HD molecule 
    Karthikeyan, B; Rajamanickam, N; Bagare, S. P (Elsevier, 2006-10)
    The spectrum of HD molecule is the testing ground of both refined calculations and experimental techniques and its excited states are of considerable relevance to chemistry and astrophysics. In this study, the Franck Condon ...
  • Kinematics of Pulsar Beams 
    Kapoor, R. C; Shukre, C. S (The American Astronomical Society, 1998-07)
    We have investigated in detail the geometry of the open magnetic field line structure of an oblique dipole rotator, with a view to attaining a better understanding of the geometry of pulsar beams in the polar cap model of ...
  • Cosmic Topological Defects, Highest Energy Cosmic Rays, and the Baryon Asymmetry of the Universe 
    Bhattacharjee, P (The American Physical Society, 1998-07)
    It is pointed out that the observed extremely high energy cosmic rays (EHECR) above 1011 GeV and the observed baryon asymmetry of the Universe (BAU) may have a common origin in baryon number violating decays of supermassive ...
  • A CCD-based polarization interferometric technique for testing waveplates 
    Sankarasubramanian, K; Venkatakrishnan, P (Elsevier Science Ltd, 1998-02)
    A CCD-based polarization interferometric technique is developed to test waveplates. A Babinet compensator is used to produce interference fringes for polarized input and the retardance introduced by the waveplate when ...
  • Shear-Wave Structure of the South Indian Lithosphere from Rayleigh Wave Phase-Velocity Measurements 
    Mitra, S; Priestley, K; Gaur, V. K; Rai, S. S (The Seismological Society of America, 2006-08)
    We investigate the upper mantle shear-wave speed structure beneath the south Indian shield by measuring and modeling fundamental mode Rayleigh wave phase-velocity dispersion. Observed phase velocities for the south Indian ...
  • Sunspot Motions Associated with Flares 
    Sundararaman, K; Selvendran, R; Thiagarajan, R (Kluwer Academic Publishers, 1998-06)
    The evolution of five bipolar sunspot groups during their disk passage leading to flares are analysed and studied using Kodaikanal Observatory photoheliogram and spectroheliogram data. The changes in the orientation angle ...
  • The Dependence of Chromospheric CA II K Network Cell Sizes on Solar Latitude 
    Raju, K. P; Srikanth, R; Singh, J (Springer, 1998-06)
    Calcium K line spectroheliograms obtained during the solar minimum phases at Kodaikanal between 1913–1974 have been used to study the network cell sizes. The autocorrelation is calculated for two-dimensional strips at 5° ...
  • On the nature of response of dayside equatorial geomagnetic H-field to sudden magnetospheric compressions 
    Sastri, J. H; Yumoto, K; Rao, J. V. S. V; Subbiah, R (Elsevier, 2006-09)
    A step-like increase in the solar wind ram pressure causes a sudden compression of the magnetosphere which manifests as a sudden commencement (SC) in the geomagnetic field. SC manifests in two basic forms in the geomagnetic ...
  • Lifetimes of the metastable D3/2, 5/22 states in Ca+ , Sr+ , and Ba+ 
    Sahoo, B. K; Md. Islam, R; Das, B. P; Chaudhuri, R. K; Mukherjee, D (The American Physical Society, 2006-12)
    Atomic properties involving the low-lying excited D3/2,5/22 states in alkaline-earth-metal ions are of current interest in many different applications ranging from tests of physics beyond the standard model to astrophysics. ...
  • Non-parallel propagation of hydromagnetic surface waves in the presence of steady shear-flows 
    Joarder, P. S; Satya Narayanan, A (European Southern Observatory, 2000-07)
    The combined effect of non-parallel propagation and steady shear-flows on the properties of hydromagnetic surface waves is examined for two different orderings of physical parameters that are expected at the edge of a hot ...
  • The 1024 channel digital correlator receiver of the Gauribidanur radioheliograph 
    Ramesh, R; Sundararajan, M. S; Sastry, Ch. V (Springer, 2006-02)
    A low frequency (40 150 MHz) radioheliograph for observations of the solar corona is in operation for the last few years at the Gauribidanur radio observatory, about 100 km north of Bangalore. The array has 32 antenna ...
  • Frequency-Dependent Lg Attenuation in the Indian Platform 
    Mitra, S; Priestley, K; Gaur, V. K; Rai, S. S (Seismological Society of America, 2006-12)
    We use seismograms from regional earthquakes recorded on digital seismographs in peninsular India to determine the frequency-dependent Q of Lg for the Indian platform. We measure Lg attenuation by determining the decay of ...
  • Astrophysically Useful Parameters for Some Vibronic Transitions of AlH and BH 
    Karthikeyan, B; Raja, V; Rajamanickam, N; Bagare, S. P (Springer, 2006-12)
    For molecular identification in astrophysical sources, an astrophysicist needs some spectroscopic parameters such as dissociation energy, vibrational or rotational temperature of the source, band or line wavelengths, ...
  • Ionospheric storm of early November 1993 in the Indian equatorial region 
    Sastri, J. H; Jyoti, N; Somayajulu, V. V; Chandra, H; Devasia, C. V (The American Geophysical Union., 2000-08)
    An investigation is made of the response of equatorial ionosphere in the Indian (75°E) sector to the major magnetic storm of November 3, 1993, using data from the ionosonde and magnetometer networks spanning the region ...
  • Low resolution spectroscopy of hot post-AGB candidates 
    Parthasarathy, M; Vijapurkar, J; Drilling, J. S (EDP Sciences, 2000-08)
    Spectral types are determined from low resolution optical spectra of 40 IRAS sources with far-infrared colours similar to planetary nebulae. The presence of circumstellar dust, high galactic latitude, and early supergiant ...
  • Torsion Modified Plasma Screening in Astrophysics 
    Sivaram, C; de Andrade, L. C. G (World Scientific Publishing Company, 2000-06)
    The torsion modified Maxwell–Proca equations when applied to describe a plasma is shown to lead to a correction to the Debye screening length. For hot new born neutron stars the torsion correction is shown to be significant. ...
  • Singature of Dirac vs majorana of neutrinos from HECR 
    Balaji, K. R. S; Bhattacharjee, P; Mohanty, S; Nayak, S. N (Indian Academy of Sciences, 2000-08)
  • Ultra high energy cosmic rays above 1011 GeV: Hints to new physics beyond Standard Model 
    Bhattacharjee, P (Indian Academy of Sciences, 2000-08)
    The observed cosmic ray events above 10/Sup11 GeV are difficult to explain within the context of known physics of propagation of known particles in the Universe and within the standard acceleration mechanisms that are ...
  • Radiative transfer in the dusty, irradiated expanding atmospheres of close binary components 
    Srinivasa Rao, M; Peraiah, A (EDP Sciences, 2000-09)
    We studied the formation of lines in the irradiated expanding dusty atmospheres of the components of close binary systems. We considered a two-level atom approximation in Non-LTE situation with complete redistribution. The ...

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