IIA Institutional Repository: Recent submissions

  • Cosmic Strings and Celestial Objects 
    Sivaram, C (Nature Publishing Group, 1987-05)
  • Radio emission by parallel acceleration mechanism 
    Krishan, V; Sivaram, C (Springer, 1983-04)
    The equations describing the linear-acceleration mechanism of radiation emission are generalized and applied to type III and IIIb solar radio bursts. A general expression for the power emitted by an electron in a spatially ...
  • The optical spectrum of nova LW Serpentis 1978 
    Prabhu, T. P; Anupama, G. C (Kluwer Academic Publishers, 1987-03)
    Optical spectroscopic data of the nova LW Serpentis 1978, covering its diffuse-enhanced phase until the onset of the forbidden O I line flash, were obtained at the Vainu Bappu Observatory, Kavalur, between March 10 and ...
  • Absorption bursts in the radio emission from the sun at decameter wavelengths 
    Sastry, Ch. V; Subramanian, K. R; Krishan, V (Gordon and Breach Science Publishers, 1983)
    Some characteristics of sudden decreases in the observed radio emission from the sun at decameter wavelengths are presented, and possible interpretations are discussed. These 'absorption bursts' occurred during periods of ...
  • Maximum Entropy Method for Polarized Images 
    Shevgaonkar, R. K (The European Southern Observatory, 1987-04)
    A simple maximum entropy method algorithm for deconvolving polarized images obtained from synthesis observations has been described here. A general purpose Fortran program is also developed. it demonstrated that although ...
  • Why has Uranus toppled over? 
    Kochhar, R. K (Indian Academy of Sciences, 1989-10)
  • Localization of Io and non-Io sources of Jovian decameter emission 
    Boischot, A; Sastri, J. H; Zarka, P (The European Southern Observatory, 1987-03)
    The observation of interplanetary scintillations (IPS) of the decameter radio emission from Jupiter provides information about the structure and position of the sources of emission. The paper presents the analysis of all ...
  • Lower bounds on neutron star mass and moment of inertia implied by the millisecond pulsar 
    Datta, B; Ray, A (The Royal Astronomical Society, 1983-08)
    The short period of the millisecond pulsar PSR 1937+214 implies that it could be close to the onset of rotational instabilities. Conditions of rotational stability imply lower bounds on the mass and moment of inertia and ...
  • Poleward migration of the magnetic neutral line and the reversal of the polar fields on the sun. I - Period 1945-1981 
    Makarov, V. I; Fatianov, M. P; Sivaraman, K. R (Springer, 1983-06)
    Poleward migration of the magnetic neutral line on the sun has been calculated for the periods 1945-1950 and 1955-1981 using synoptic charts based on H-alpha observations. Epochs of sign reversal of the solar magnetic field ...
  • Aberration and advection effects in a plane-parallel medium in motion 
    Peraiah, A (American Astronomical Society, 1987-06)
    The effects of aberration and advection terms in the fluid-frame steady-state radiative-transfer equation are evaluated by means of numerical computations for plane-parallel media moving at velocities 1000, 2000, 3000, ...
  • Poleward migration of the magnetic neutral line and the reversal of the polar fields on the sun. II - Period 1904-1940 
    Makarov, V. I; Sivaraman, K. R (Springer, 1983-06)
    Poleward migration of the magnetic neutral line on the sun has been computed for the period 1904-1940 using synoptic charts based on H-alpha observations and the epochs of sign reversal of the solar magnetic field at ...
  • Broad-band, high-resolution photograph of the solar corona February 16, 1980 
    Scaria, K. K (Springer, 1983-06)
    Unsharp masking may be used for better reproduction of over-exposed solar corona photographs.
  • Rotating neutron star structure - Implications of the millisecond pulsar PSR 1937 + 214 
    Ray, A; Datta, B (The American Astronomical Society, 1984-07)
    Rapidly rotating fluid objects of a given mass can remain stable only up to a critical angular speed, beyond which they may undergo instabilities leading to disruption. A semi-Newtonian condition of rotational stability ...
  • Neutron oscillation and the primordial magnetic field 
    Sivaram, C; Krishan, V (Gordon and Breach Science Publishers, 1983)
    The phenomenon of neutron-antineutron oscillations, recently proposed as a novel consequence of grand unified theories, permits limits to be placed on any primordial field present during the nucleosynthetic stage of the ...
  • 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 ...

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