IIA Institutional Repository: Recent submissions

  • On the non-acceleration origin of the highest energy cosmic rays 
    Sivaram, C (University of Calgary, 1993)
    The Hawking radiation from primordial black holes in their near terminal stages of evaporation can produce ultra high energy (UHE) particles spontaneously. The contribution from such objects to the highest energy cosmic ...
  • Constraints on the neutrino magnetic moment from stellar evolution and supernovae type Ia 
    Sivaram, C (University of Calgary, 1993)
    There are several interesting consequences of a neutrino magnetic moment(NMM) such as possibility of a time varying solar neutrino signal (ENS), increased cooling of red giants and enhanced evolution of horizontal branch ...
  • Cosmic upper limits on the electric charges of the photon and the neutrino 
    Sivaram, C (University of Calgary, 1993)
    More stringent upper limits on the electric charge of photons than those deduced earlier from astrophysical considerations are given. Similar limits for the neutrino are given. These are more tight than those from arguments ...
  • The Peculiar Type Ia Supernova 2005hk 
    Stanishev, V; Taubenberger, S; Blanc, G; Anupama, G. C; Benetti, S; Cappellaro, E; Elias-Rosa, N; Féron, C; Goobar, A; Krisciunas, K; Pastorello, A; Sahu, D. K; Salvo, M. E; Schmidt, B. P; Sollerman, J; Thöne, C. C; Turatto, M; Hillebrandt, W (American Institute of Physics, 2007-08)
    We present a preliminary analysis of an extensive set of optical observations of the Type Ia SN 2005hk. We show that the evolution of SN 2005hk closely follows that of the peculiar SN 2002cx. SN 2005hk is more luminous ...
  • Time-dependent convective collapse of flux tubes 
    Hasan, S. S (D. Reidel Publishing Co, 1983)
    The time-dependent collapse of a slender flux tube extending vertically in the convection zone of the sun is modelled. Starting from an initial state in which the flux tube is in hydrostatic equilibrium, the non-linear MHD ...
  • Prospects for observations of transient UV Events with the TAUVEX UV observatory 
    Safonova, M; Sivaram, C; Murthy, J (Springer, 2008-11)
    Transient events have posed special problems in astronomy because of the intrinsic difficulty of their detection, and a new class of observatories such as the Pan-STARRS and LSST are coming up specifically to observe these ...
  • Multiwavelength Analysis of the Intriguing GRB 061126: The Reverse Shock Scenario and Magnetization 
    Gomboc, A; Kobayashi, S; Guidorzi, C; Melandri, A; Mangano, V; Sbarufatti, B; Mundell, C. G; Schady, P; Smith, R. J; Updike, A. C; Kann, D. A; Misra, K; Rol, E; Pozanenko, A; Castro-Tirado, A. J; Anupama, G. C; Bersier, D; Bode, M. F; Carter, D; Curran, P; Fruchter, A; Graham, J; Hartmann, D. H; Ibrahimov, M; Levan, A; Monfardini, A; Mottram, C. J; O'Brien, P. T; Prema, P; Sahu, D. K; Steele, I. A; Tanvir, N. R; Wiersema, K (The American Astronomical Society, 2008-11)
    We present a detailed study of the prompt and afterglow emission from Swift GRB 061126 using BAT, XRT, UVOT data and multicolor optical imaging from 10 ground-based telescopes. GRB 061126 was a long burst (T90=191 s) with ...
  • Gravitational instability of interstellar magnetic clouds 
    Ghosh, K. K; Bhattacharyya, J. C (D. Reidel Publishing Co.,, 1985-12)
    The gravitational instability of a nonrotating isothermal gaseous disk permeated by a uniform frozen-in magnetic field is investigated using a fourth-order perturbation technique. From the results it is found that the disk ...
  • Infrared observations of UV CAS 
    Kameswara Rao, N (The Observatory, 1980-10)
  • Some constraints on quasar progenitors and quasar evolution 
    Sivaram, C (International Astronomical Union, 1986)
  • Fast pulsars - Effects of spacetime curvature and rotation on the pulse characteristics 
    Kapoor, R. C; Datta, B (The American Astronomical Society, 1985-10)
    The effects of spacetime curvature and rotation on the pulse profile of fast pulsars are studied using a rotationally perturbed spherical metric and a representative choice of the equation of state for neutron star matter. ...
  • Search for optical bursts from the gamma ray burst source GBS 0526-66 
    Seetha, S; Sreenivasaiah, K. V; Marar, T. M. K; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (NASA/STI, 1985-08)
    Attempts were made to detect optical bursts from the gamma-ray burst source GBS 0526-66 during Dec. 31, 1984 to Jan. 2, 1985 and Feb. 23 to Feb. 24, 1985, using the one meter reflector of the Kavalur Observatory. Jan. 1, ...
  • Homologous microwave bursts and associated solar flares 
    Gopala Rao, U. V (D. Reidel Publishing Company, 1970-10)
    Homologous characteristics of radio bursts at 3000 MHz and associated optical flares are studied. It is found that flares associated with homologous radio bursts are also homologous optically.
  • Variation in continuum brightness and equivalent widths of lines in sunspot penumbrae 
    Bhatnagar, A (Springer - Verlag, 1966)
    Variations in the continuum brightness and in the equivalent widths of lines have been observed in the sunspot penumbral spectra. Darker regions in the continuum of the penumbrae show widening of lines, while the brighter ...
  • A technique for measurement of rotational frequency 
    Das, G. C (D. Reidel Publishing Co., 1979-12)
    On the basis of Chandrasekhar's proposition that the Coriolis force has an influence on the magnetohydrodynamic waves excited in cosmic phenomena, a simple approximate formula determining the rotational frequency from the ...
  • Decameter radio emission from Jupiter and solar activity 
    Sastry, Ch. V (Elsevier Science, 1968-09)
    It is found that there is an apparent increase in solar activity prior to the emission of decametric radio bursts from Jupiter during years of high solar activity. It is pointed out that Jupiter data contains artificial ...
  • Structures in Saturn's Magnetosphere 
    Bhattacharyya, J. C (Indian Academy of Sciences, 1995-12)
  • The pulses as a diagnostic technique in the sun 
    Das, G. C (D. Reidel Publishing Co., 1980-08)
    A method of finding physical parameters by studying the pulses in the sun is discussed. Consideration is given to an ideal highly relevant model which could exist in the sun with the effects of ionization, due to which ...
  • Radio emission from an intense electromagnetic beam-plasma system 
    Krishan, V (D. Reidel Publishing Co., 1979-06)
    Interaction of a high-intensity and low-frequency electromagnetic beam with a plasma is investigated. The dynamics of plasma particles under this strong electromagnetic field is calculated without using the perturbation ...
  • Eigenfrequencies of radial pulsations of strange quark starsEigenfrequencies of radial pulsations of strange quark stars 
    Datta, B; Sahu, P. K; Anand, J. D; Goyal, A (Elsevier, 1992-06)
    We calculate the range of eigenfrequencies of radial pulsations of stable strange quark stars, using the general relativistic pulsation equation and adopting realistic equation of state for degenerate strange quark matter.

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