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Browsing IIAP Publications by Title

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  • Daytime equatorial VHF radiowave scintillations and sporadic-E layer 
    Koparkar, P. V; Rastogi, R. G; Sastri, J. H (The Council of Scientific and Industrial Research, 1989-08)
    Daytime VHF radiowave scintillations at Trivandrum are compared with the E-region irregularities at Kodaikanal. It is shown that daytime scintillations at Trivandrum are basically of two categories. One type of scintillations ...
  • Daytime ionosphere scintillation associated with geomagnetic storms 
    Deshpande, M. R; Vats, H. O; Sethia, G; Murthy, B. S (Nature Publishing Group, 1977-08)
  • Daytime satellite radio scintillation and sporadic E near the magnetic equator 
    Rastogi, R. G; Deshpande, M. R; Murthy, B. S; Davies, K (American Geophysical Union, 1977-03)
    An investigation is conducted concerning the association between the daytime scintillations of ATS-6 signals received at Ootacamund and the ionograms at the nearby station Kodaikanal, India. The investigation shows that ...
  • Dead or Alive? Long-term evolution of SN 2015bh (SNhunt275) 
    Elias-Rosa, N; Pastorello, A; Benetti, S; Cappellaro, E; Taubenberger, S; Terreran, G; Fraser, M; Brown, P. J; Tartaglia, L; Morales-Garoffolo, A; Harmanen, J; Richardson, N. D; Artigau, E; Tomasella, L; Margutti, R; Smartt, S. J; Dennefeld, M; Turatto, M; Anupama, G. C; Arbour, R; Berton, M; Bjorkman, K. S; Boles, T; Briganti, F; Chornock, R; Ciabattari, F; Cortini, G; Dimai, A; Gerhartz, C. J; Itagaki, K; Kotak, R; Mancini, R; Martinelli, F; Milisavljevic, D; Misra, K; Ochner, P; Patnaude, D; Polshaw, J; Sahu, D. K; Zaggia, S (Oxford University Press on behalf of the Royal Astronomical Society, 2016-12)
    Supernova (SN) 2015bh (or SNhunt275) was discovered in NGC 2770 on 2015 February with an absolute magnitude of Mr ∼ −13.4 mag, and was initially classified as an SN impostor. Here, we present the photometric and spectroscopic ...
  • The Decameter and Meter Wave Radiotelescopes in India and Mauritius 
    Sastry, Ch. V (Springer, 1995-05)
    The Indian Institute of Astrophysics and the Raman Research Institute in a joint collaboration program operate the Gauribidanur radio observatory. Details of the various radiotelescopes available at the observatory are ...
  • 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 ...
  • Decameter Wavelength Observations of an Absorption Burst from the Sun and Its Association with an X2.0/3B Flare and the Onset of a ``Halo'' Coronal Mass Ejection 
    Ramesh, R; Ebenezer, E (The American Astronomical Society, 2001-09)
    We report a transient intensity reduction/absorption burst observed at decameter wavelengths in close temporal association with an X2.0/3B flare near the disk center and the onset of a ``halo'' coronal mass ejection. The ...
  • The decameter-wave radio telescope 
    Sastry, Ch. V (Astronomical Society of India, 1983-06)
  • Decay of massive photinos and gravitinos and keV X-ray background 
    Sivaram, C (INSDOC, 1983-08)
    The contributions of the decay of supersymmetry-breaking photinos and gravitinos with masses of a few keV to the X-ray background and of neutrinos with mass about 20 eV to the UV background are discussed, using the Coma ...
  • Decaying turbulence and magnetic fields in galaxy clusters 
    Sur, Sharanya (Oxford University Press on behalf of the Royal Astronomical Society, 2019-12)
    We explore the decay of turbulence and magnetic fields generated by fluctuation dynamo action in the context of galaxy clusters where such a decaying phase can occur in the aftermath of a major merger event. ...
  • Decaying turbulence and magnetic fields in galaxy clusters 
    Sur, Sharanya (Oxford University Press on behalf of the Royal Astronomical Society, 2019-09)
    We explore the decay of turbulence and magnetic fields generated by fluctuation dynamo action in the context of galaxy clusters where such a decaying phase can occur in the aftermath of a major merger event. Using idealized ...
  • Deciphering Solar Magnetic Activity: 140 Years of the ‘Extended Solar Cycle’ – Mapping the Hale Cycle 
    McIntosh, Scott W; Leamon, Robert J; Egeland, Ricky; Dikpati, Mausumi; Altrock, Richard C; Banerjee, D; Chatterjee, Subhamoy; Srivastava, Abhishek K; Velli, Marco (Springer, 2021-12)
    We investigate the occurrence of the “extended solar cycle” (ESC) as it occurs in a host of observational data spanning 140 years. Investigating coronal, chromospheric, photospheric, and interior diagnostics, we develop ...
  • Decoding the compositions of four bright r-process-enhanced stars 
    Saraf, Pallavi; Prieto, Carlos Allende; Sivarani, T; Bandyopadhyay, A; Beers, Timothy C.; Susmitha, A (Oxford University Press on behalf of Royal Astronomical Society, 2023-10)
    There has been a concerted effort in recent years to identify the astrophysical sites of the r-process that can operate early in the galaxy. The discovery of many r-process-enhanced (RPE) stars (especially by the R-process ...
  • Decoding the X-Ray Flare from MAXI J0709–159 Using Optical Spectroscopy and Multiepoch Photometry 
    Bhattacharyya, Suman; Mathew, Blesson; Ezhikode, Savithri H; Muneer, S; Selvakumar, G; Maheswar, G; Arun, R; Anilkumar, Hema; Banerjee, Gourav; Kumar, S. P; Kartha, Sreeja S; Paul, KT; Velu, C (IOP Publishing, 2022-07-10)
    We present a follow-up study on the recent detection of two X-ray flaring events by MAXI/Gas Slit Camera observations in soft and hard X-rays from MAXI J0709–159 in the direction of HD 54786 (LY CMa), on 2022 January 25. ...
  • Decollimation of a jet due to spacetime curvature 
    Kapoor, R. C (International Astronomical Union, 1986)
  • Decomposition of the Galactic Disk: Abundances and Kinematics 
    Reddy, B. E (Cambridge University Press, 2007-08)
    To this contribution we present a brief review of our recent abundance surveys (Reddy et al. 2003; Reddy et al. 2006) of the Milky Way galaxy. Survey focussed on controlled samples of stars selected based on their kinematic ...
  • Deconstructing IRAS 07027-7934 
    Surendiranath, R (EDP Sciences, 2002-08)
    The planetary nebula IRAS 07027-7934 has a compact ionized core surrounded by a large cloud of matter believed to be of neutral gas and dust particles. A photoionization model of this ionized core is presented in this ...
  • Deconvolution and self-calibration in radio astronomy using MEM 
    Shevgaonkar, R. K (Tata Institute of Fundamental Reserach, 1988)
    Aperture synthesis technique is the most powerful indirect imaging technique used in radio astronomy for obtainIng high resolution images. The technique, instead of measuring the image directly, measures its Fourier ...
  • A deep BVI photometric study of the open cluster NGC 2453 
    Mallik, D. C. V; Sagar, R; Pati, A. K (EDP Sciences, 1995-12)
    CCD observations of the open cluster NGC 2453 have been carried out in B, V and I passbands. A total of 356 stars have been observed in a field of about 4'x6' of the sky centred on the cluster. Colour-magnitude diagrams ...
  • Deep Impact, Stardust-NExT and the behavior of Comet 9P/Tempel 1 from 1997 to 2010 
    Meech, K. J; Pittichova, J; Yang, B; Zenn, A; Belton, M. J. S; A’Hearn, M. F; Bagnulo, S; Bai, J; Barrera, L; Bauer, J. M; Bedient, J; Bhatt, B. C; Boehnhardt, H; Brosch, N; Buie, M; Candia, P; Chen, W; Chesley, S; Chiang, P; Choi, Y; Cochran, A; Duddy, S; Farnham, T. L; Fernández, Y; Gutiérrez, P; Hainaut, O. R; Hampton, D; Herrmann, K; Hsieh, H; Kadooka, M. A; Kaluna, H; Keane, J; Kim, M; Kleyna, J; Krisciunas, K; Lauer, T. R; Lara, L; Licandro, J; Lowry, S. C; McFadden, L. A; Moskovitz, N; Mueller, B. E. A; Polishook, D; Raja, N. S; Riesen, T; Sahu, D. K; Samarasinha, N. H; Sarid, G; Sekiguchi, T; Sonnett, S; Suntzeff, N; Taylor, B; Tozzi, G. P; Vasundhara, R; Vincent, J; Wasserman, L; Webster-Schultz, B; Zhao, H (Elsevier B.V., 2011-05)
    We present observational data for Comet 9P/Tempel 1 taken from 1997 through 2010 in an international collaboration in support of the Deep Impact and Stardust-NExT missions. The data were obtained to characterize the nucleus ...

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