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  • The diffraction of Light and its relation to the performance of telescopes 
    Raman, C. V (Astronomical Society of India, 1912-06)
  • Diffuse echo bursts at 34.5 MHz 
    Subramanian, K. R (Indian Institute of Astrophysics, Bangalore, 1988)
    The solar radio bursts during their propagation towards the earth are refracted, scattered, reflected and absorbed. The combination of these effects play a role in determining the source size, position, brightness temperature ...
  • Diffuse gamma ray emission : Implications on cosmic ray origin 
    Sreekumar, P (Astronomical Society of India, 2002)
    The Compton Gamma Ray Observatory (CGRO) produced the first full sky survery in gamma rays resulting in significantly improved data on the spectral and spatial distribution of diffuse gamma-rays from our galaxy. The intense ...
  • Diffuse Interstellar Clouds 
    Joshi, Pushpa (Astronomical Society of India, 1974-12)
  • The Diffuse Radiation Field at High Galactic Latitudes 
    Akshaya, M. S; Murthy, J; Ravichandran, S; Henry, R. C; Overduin, J (IOP Publishing, 2018-08-10)
    We have used GALEX observations of the north and south Galactic poles to study the diffuse ultraviolet background at locations where the Galactic light is expected to be at a minimum. We find offsets of 230–290 photon units ...
  • Diffuse radiation from the Aquila Rift 
    Jyothy, S. N; Murthy, J; Karuppath, N; Sujatha, N. V (Oxford University Press on behalf of the Royal Astronomical Society, 2015-12-01)
    We present an analysis of the diffuse ultraviolet (UV) background in a low latitude region near the Aquila Rift based on observations made by the Galaxy Evolution Explorer (GALEX). The UV background is at a level of about ...
  • Diffuse radio emission from the coma cluster of galaxies at decametre wavelengths 
    Sastry, Ch. V; Shevgaonkar, R. K (Indian Academy of Sciences, 1983-03)
    We have observed the region of the Coma cluster at 34.5 MHz with a resolution of 26 arcmin × 40 arcmin. A map of the diffuse halo (Coma C) is presented. The size of the halo is found to be 54 arcmin × 30 arcmin. The position ...
  • The Diffuse Ultraviolet Foreground 
    Murthy, J (Springer, 2014-01)
    Ultraviolet observations from low Earth orbit (LEO) have to deal with a foreground comprised of airglow and zodiacal light which depend on the look direction and on the date and time of the observation. We have used all-sky ...
  • The diffuse, relic radio source in Abell 85: estimation of cluster-scale magnetic field from inverse Compton X-rays 
    Bagchi, J; Pislar, V; Lima Neto, G. B (Royal Astronomical Society, 1998-05)
    We report the first detection of an inverse Compton X-ray emission, spatially correlated with a very steep spectrum radio source (VSSRS), 0038-096, without any detected optical counterpart, in cluster Abell 85. The ROSAT ...
  • Digital long focal length lenslet array using spatial light modulator 
    Vyas, A; Roopashree, M. B; Prasad, B. R (Central Scientific Instruments Organisation (CSIR), 2009-11)
    Under a thin lens and paraxial approximation, the phase transformation function of a lens was simulated on a Liquid Crystal (LC) based Spatial Light Modulator (SLM). The properties of an array of such lenses simulated ...
  • Digitization of Kodaikanal Data 
    Singh, J; Muneer, S; Bagare, S. P; Rangarajan, K. E; Ramesh, K. B; Varghese, B. A; Samson, J. P. A; Devendran, P; Hariharan, G (Astronomical Society of India, 2003)
    In this report we describe a digitizer developed in the laboratories of the Indian Institutes of Astrophysics (IIA) to digitize the large amount of solar synoptic data obtained since 1904 at Kodaikanal. We show a sample ...
  • Digitized archive of the Kodaikanal images: Representative results of Solar cycle variation from sunspot area determination 
    Ravindra, B; Priya, T. G; Amareswari, K; Priyal, M; Nazia, A. A; Banerjee, D (EDP Sciences, 2013-02)
    Photographic images are valuable data resources for studying long term changes in the solar magnetic field and its influence on the Earth's climate and weather. We digitized more than 100 years of white light images stored ...
  • Direct estimates of the solar coronal magnetic field using contemporaneous extremeultraviolet, radio, and white-light observations 
    Anshu Kumari; Ramesh, R; Kathiravan, C; Wang, T. J; Gopalswamy, N (IOP Publishing, 2019-08-10)
    We report a solar coronal split-band type II radio burst that was observed on 2016 March 16 with the Gauribidanur Radio Spectro-Polarimeter in the frequency range ≈90–50 MHz, and the Gauribidanur RadioheliograPH at two ...
  • Direct generation of electromagnetic radiation from a beam-plasma system 
    Krishan, V (Institute of Physics, 1980-02)
    A possible mechanism for the direct generation of electromagnetic modes of frequencies near the electron plasma frequency, is suggested. The spatial variation of the interplanetary magnetic field seems to play an essential ...
  • Directivity of solar microwave bright regions 
    Gopala Rao, U. V (D. Reidel Publishing Company, 1968-08)
  • The Disappearance of the Unseen (Evaporating Black Holes) 
    Fahey, R. P (Astronomical Society of India, 1977-03)
  • Disappearing solar filaments and geomagnetic activity 
    Sastri, J. H (Springer, 1986-05)
    As a sequel to the recent identification of the high-speed stream as the candidate structure in the solar wind at 1 AU that is primarily responsible for the geomagnetic disturbances occasionally noticed after 'disparition ...
  • Discovering a celestial object using a non-parametric algorithm 
    Vyasanakere, Jayanth P; Bhatnagar, Siddharth; Murthy, J (Springer, 2021-12)
    We describe a method that does not use any orbital parameters, to arrive at the position and mass of a new celestial object, using high-precision orbital state vector data of the rest of the objects in the system. As ...
  • Discovery and rapid follow-up observations of the unusual type II SN 2018ivc in NGC 1068 
    Bostroem, K. A; Valenti, S; Sand, D. J; Andrews, J. E; Van Dyk, S. D; Galbany, L; Pooley, D; Amaro, R. C; Smith, N; Yang, S; Anupama, G. C; Arcavi, I; Baron, E; Brown, P. J; Burke, J; Cartier, R; Hiramatsu, D; Dastidar, R; DerKacy, J. M; Dong, Y; Egami, E; Ertel, S; Filippenko, A. V; Fox, O. D; Haislip, J; Hosseinzadeh, G; Howell, D. A; Gangopadhyay, A; Jha, S. W; Kouprianov, V; Kumar, B; Lundquist, M; Milisavljevic, D; McCully, C; Milne, P; Misra, K; Reichart, D. E; Sahu, D. K; Sai, H; Singh, A; Smith, P. S; Vinko, J; Wang, X; Wang, Y; Wheeler, J. C; Williams, G. G; Wyatt, S; Zhang, J; Zhang, X (IOP Publishing, 2020-05-20)
    We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual SNe II that exploded in NGC 1068 (D = 10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope ...
  • Discovery of a flare star near Sirius 
    Sharma, D. P; Marar, T. M. K; Seetha, S; Shyla, K. S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Rozario, M. J (D. Reidel Publishing Co., 1983-04)
    The discovery of a flare star (R.A. (1950)=6/Suph43/Supm6/Sups.07, Decl.(1950)=–16°45'24") located about 6 arc min south of Sirius is reported. During photometric observations on the night of 13 January, 1982, using the ...

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