IIA Institutional Repository: Recent submissions

  • Solar physics in India: recent and current research activities 
    Rajaguru, S. P (Indian Institute of Astrophysics, 2011)
  • Science with a Wide-Field UV Transient Explorer 
    Sagiv, I; Gal-Yam, A; Ofek, E. O; Waxman, E; Aharonson, O; Kulkarni, S. R; Nakar, E; Maoz, D; Trakhtenbrot, B; Phinney, E. S; J. Topaz, J; Beichman, C; Murthy, J; Worden, S. P (IOP Publishing, 2014-04)
    The time-variable electromagnetic sky has been well-explored at a wide range of wavelengths. In contrast, the ultra-violet (UV) variable sky is relatively poorly explored, even though it offers exciting scientific prospects. ...
  • Solar physics at Indian Institute of Astrophysics 
    Venkatakrishnan, P; Krishan, V (Indian Institute of Astrophysics, 1989-12)
  • Residual foreground contamination in the WMAP data 
    Pravabati, C; Park, C (IOP Publishing, 2014)
    We have studied whether there is any residual foreground contamination in the foreground reduced WMAP-7 data for the differential assemblies (DAs) Q, V and W. We have calculated the correlation between the foreground map, ...
  • Highlights of scientific activities in India during the International Geophysical Year: IGY 1957 - 1958 
    Indian Institute of Astrophysics (Indian Institute of Astrophysics, 2006-11)
  • Indian Institute of Astrophysics 
    Kochhar, R. K (Indian Institute of Astrophysics, 1994-01)
  • Indian Institute of Astrophysics 
    Kochhar, R. K (1986-11)
  • J. C. Bhattacharyya (1930 - 2012) 
    Indian Institute of Astrophysics (Indian Institute of Astrophysics, 2014-03-17)
  • The evolution of the Net Twist Current and the Net Shear Current in active region NOAA 10930 
    Suthar, Y; Venkatakrishnan, P; Ravindra, B; Jaaffrey, S. N. A (Springer, 2014-07)
    The electric current exists because of the non-potential magnetic field in solar active regions. We present the evolution of net current in the solar active region NOAA 10930 as the sum of shear current and twist current ...
  • Reflection effect in close binaries: effects of reflection on spectral lines 
    Srinivasa Rao, M; Varghese, B. A (Springer, 2014-02)
    Reflection effect phenomenon is studied on the formation of spectral lines in a close binary system when primary component has an extended atmosphere and the secondary component is a point source. Irradiation effect is ...
  • Temporal offsets among solar activity indicators 
    Ramesh, K. B; Vasantharaju, N (Springer, 2014-04)
    Temporal offsets between the time series of solar activity indicators provide important clues regarding the physical processes responsible for the cyclic variability in the solar atmosphere. Hysteresis patterns generated ...
  • Observations of O vi absorption from the superbubbles of the large magellanic cloud 
    Pradhan, A. C; Pathak, A; Murthy, J; Ojha, D. K (Cambridge University Press, 2014-01)
    We have presented the observations of O VI absorption at 1032 Å towards 22 sightlines in 10 superbubbles (SBs) of the Large Magellanic Cloud (LMC) using the data obtained from the Far Ultraviolet Spectroscopic Explorer ...
  • Optical studies of Type IIb SN 2011dh 
    Sahu, D. K; Anupama, G. C; Chakradhari, N. K (Cambridge University Press, 2014-01)
    UBVRI photometry and low resolution optical spectroscopy of the type IIb SN 2011dh in M51 are presented, covering the first year after the explosion. The peak absolute magnitude in V-band of −17.12±0.18 mag indicates SN ...
  • Calibration of a Sky radiometer (Prede) using observations obtained from Hanle and Merak high-altitude stations in Ladakh 
    Shantikumar, N. S; Bagare, S. P; Rajendra, B. S; Campanelli, M; Khatri, P; Dorjey, N (Elsevier B.V, 2014-06-15)
    The present work was carried out to check the performance of a Prede Sky radiometer and the stability of the solar calibration constant (F0s) at two high altitude pristine stations, Hanle and Merak in Ladakh region during ...
  • Optical observations of supernova 2012aw 
    Bose, S; Kumar, B; Sutaria, F. K; Roy, Rupak; Kumar, B; Bhatt, V. K; Chakraborti, S (Cambridge University Press, 2014-01)
    We present optical UBVRI photometric and low-resolution spectroscopic follow-up observations of a type II SN 2012aw in a nearby (~10 Mpc) galaxy M95 during 4 to 270 days post-explosion. The evolution characteristics of ...
  • Evolution of the Type IIb SN 2011fu 
    Pandey, S. B; Kumar, B; Sahu, D. K; Vinko, J; Moskvitin, A. S; Anupama, G. C; Bhatt, V. K; Ordasi, A; Nagy, A; Sokolov, V. V; Sokolova, T. N; Komarova, V. N; Kumar, B; Bose, S; Roy, R; Sagar, R (Cambridge University Press, 2014-01)
    The UBVRI photometric follow-up of SN 2011fu has been initiated a few days after the explosion, shows a rise followed by steep decay in all bands and shares properties very similar to that seen in case of SN 1993J, with a ...
  • The optical photometric and spectroscopic investigation of type IIP supernova 2012A 
    Roy, R; Sutaria, F. K; Bose, S; Johnson, S; Dwarkadas, V; York, B; Kumar, B; Kumar, B; Bhatt, V. K; Chakraborti, S; York, D; Ritchey, A; Saurage, G; Kaiser, M B (Cambridge University Press, 2014-01)
    Supernova 2012A was discovered on 7.39UT, January, 2012 in the nearby galaxy NGC 3239 at an unfiltered magnitude of 14.6 and classified spectroscopically as a Type IIP event. Here, we present the optical photometric and ...
  • Radio observations of a nearby type IIP SN 2012aw 
    Yadav, N; Ray, A; Chakraborti, S; Stockdale, C; Chandra, P; Smith, R; Roy, R; Dwarkadas, V; Sutaria, F. K; Pooley, D; Kumar, B; Bose, S (Cambridge University Press, 2014-01)
    SN 2012AW is a type-IIP supernova which exploded in M95. In this paper we discuss the radio observations of this supernova and model them to determine the important parameters relevant to the explosion and the evolution ...
  • Spectrographic study of Wolf-rayet stars 
    Ganesh, K. S (Kodaikanal Observatory, Kodaikanal, 1966-11)
  • Characterization of aerosol optical properties over the high-altitude station Hanle, in the trans-Himalayan region 
    Shantikumar, N. S; Bagare, S. P; Sinha, N; Rajendra, B. S; Srivastava, A. K; Larson, E; Kanawade, V. P (Elsevier B.V, 2014-03-01)
    Optical properties of aerosols over Hanle (4500 m amsl) in the western Himalayas were studied using skyradiometer observations during October 2007 to December 2010. Yearly mean value of aerosol optical depth (AOD) at 500 ...

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