IIA Institutional Repository: Recent submissions

  • Collective acceleration in solar flares 
    Barletta, W; Gershtein, S. S; Krishan, V; Reiser, M; Sessler, A. M; Xie, M (The Royal Swedish Academy of Sciences, 1994)
    Solar flare data are examined with an eye to seeing if they suggest collective acceleration of ions. That, in fact, seems to be the case. The collective acceleration mechanism of Gershtein is reviewed and the possibilities ...
  • Origin of short-period (30-300 s) Doppler frequency fluctuations of lower F region reflections in the equatorial electrojet region 
    Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V; Somayajulu, V. V (American Geophysical Union, 1991-12)
    Measurements of phase path P of lower F-region reflections at normal incidence at Kodaikanal revealed the ubiquitous presence of 30-300-s quasi-sinusoidal variations in the time rate of change of phase path, P (Doppler ...
  • Role of plasma processes in astrophysics 
    Krishan, V (The Royal Swedish Academy of Sciences, 1994)
    The universe is made up of plasmas and fluids. The plasma phenomena exhibits itself through electromagnetic processes and the fluid through configurational processes. I shall try to illustrate both these aspects by taking ...
  • On the nature of substorm-related transient electric field disturbances in the equatorial ionosphere 
    Sastri, J. H; Ramesh, K. B; Karunakaran, D (Elsevier, 1992-01)
    Results are presented of a study of h-prime F data derived from interval ionograms recorded on the night of August 29-30, 1957 at Kodaikanal (10 deg 14 min N, 77 deg 29 min E, geomag. lat. 0.6 deg N) during a geomagnetic ...
  • Penetration electric fields at the nightside dip equator associated with the main impulse of the storm sudden commencement of 8 July 1991 
    Sastri, J. H (American Geophysical Union, 2002-12)
    The geomagnetic storm sudden commencement (ssc) of 8 July 1991 was reported [Wilson et al., 2001] to be characterized by a reduction (enhancement) of X component at midlatitudes in the noon (midnight) sector in the 1-hour ...
  • Reflection of radio radiation at ionization fronts in emission line regions and accretion disks of active galactic nuclei 
    Krishan, V (The Royal Swedish Academy of Sciences, 1994)
    It is known that high frequency short duration electromagnetic pulses can be generated by reflection of low frequency radiation off relativistically moving ionization fronts. In addition, a part of the incident electromagnetic ...
  • Sporadic Variations in Wolf-Rayet Stars 
    Shylaja, B. S (International Astronomical Union, 1991)
    Many Wolf-Rayat stars display variations which are observable either spectroscopically or photometrically or both. These are not exclusively associated with binery systems. A study is made of the sporadic events in the ...
  • Abundance analysis of the long period southern Cepheid RZ Vel 
    Giridhar, S; Goswami, A; Arellano Ferro, A (Indian Academy of Sciences, 1991-03)
    An abundance analysis is conducted for the long period (P = 20.4 days), young classical Cepheid RZ Vel, a recognized member of an OB association. The results of the analysis are compared with the photometric study by Eggen ...
  • Fundamental interactions in the early universe 
    Sivaram, C (Springer, 1994-05)
    A unified approach to fundamental interactions as explored earlier is further elaborated and its consequences for the early universe studied especially in connection with the energy dependence of the coupling constants.
  • Mond, dark matter and the cosmological constant 
    Sivaram, C (Springer, 1994-09)
    A possible connection between MOND (Modification of Newtonian Dynamics) proposed as an alternative hypothesis to dark matter in galaxies and clusters and a residual cosmological constant term dominating cosmological dynamics ...
  • On structure formation in the universe 
    Satya Narayanan, A (Springer, 1994-12)
    The formation of structures in the universe is one of the most challenging problems of cosmology. In this paper, an attempt to explain the formation of galaxies through the generation of vortices (with dissipation) in an ...
  • Scattering by black holes: a simulated potential approach 
    Aguirregabiria, J. M; Vishveshwara, C. V (Elsevier B.V, 1996-01)
    The effective potential appearing in the scattering of scalar, electromagnetic and gravitational waves by a Schwarzschild black hole is replaced with potentials for which the exact analytical solutions are known. It is ...
  • Fundamental interactions in the early universe 
    Sivaram, C (Springer, 1994-12)
    A unified approach to fundamental interactions as explored earlier is further elaborated and its consequences for the early universe studied especially in connection with the energy dependence of the coupling constants.
  • Constraints on cosmic electric charge asymmetry and neutrino charge from the microwave background 
    Sengupta, S; Pal, B. P (Elsevier B.V, 1996-01)
    We point out that an overall electric charge asymmetry in the universe will generate an anisotropy in the cosmic microwave background radiation (CMBR) via the Sach-Wolfe effect. From this, an upper limit on the electric ...
  • Cherenkov radiation by massless neutrinos 
    D'Olivo, J. C; Nieves, J. F; Pal, P. B (Elsevier Science B.V, 1996-01)
    Due to their weak interactions, neutrinos can polarize a medium and acquire an induced charge. We consider the Cherenkov radiation emitted by neutrinos due to their effective electromagnetic interactions as they pass through ...
  • Partial redistribution effects on line polarization in the presence of velocity fields 
    Nagendra, K. N (Springer, 1996-03)
    Velocity fields in line formation regions strongly affect the line polarization. The conventionally used observer's frame method of solving the polarized transfer equation becomes expensive and inaccurate for partial ...
  • Equilibrium of a charged test particle with spin in the Kerr - Newman spacetime 
    Aguirregabiria, J. M; Chamorro, A; Suinaga, J; Vishveshwara, C. V (IOP Publishing, 1996-03)
    The equilibrium of a charged test particle with spin placed in the field of the Kerr - Newman metric is studied. This is an extension of the earlier work which considered a charged test particle without spin. Now, both the ...
  • Neutrino effective charge and cerenkov radiation 
    D'Olivo, J. C; Nieves, J. F; Palash, B. P (Elsevier B.V., 1996-05)
    We consider the Čerenkov radiation emitted by neutrinos due to their effective electromagnetic interactions as they pass through a polarisable medium. The effect exists even for massless, chiral neutrinos, and no physics ...
  • Axisymmetric MHD equilibrium of a self-gravitating incompressible fluid 
    Satya Narayanan, A (Royal Swedish Academy of Sciences, 1996-05)
    The equilibrium of a self-gravitating incompressible fluid with a magnetic field and large electrical conductivity is studied. The magnetic fields and fluid motions are assumed to have a symmetry about an axis. The basic ...
  • On the quantization of general relativity in anholonomic variables 
    Borzeszkowski, H. H. V; de Sabbata, V; Sivaram, C; Treder, H. J (Springer, 1996-04)
    In discussing Bohr-Sommerfeld-like quantum rules for gravity, it is argued that Einstein's Riemannian theory of general relativity rather leads to a quantum field-mechanics than to a quantum-field theory of gravity. We ...

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