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Browsing IIAP Publications by Title

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  • The 1995 Total Solar Eclipse: An Overview 
    Singh, J (Indian Institute of Astrophysics, 1997)
    As we know, we owe the discovery of solar corona to the observation of total solar eclipse. Inspite of all that has been learned, coronal studies still remain the most important aspect of scientific investigation during ...
  • The 1995-96 decline of R Coronae Borealis: high-resolution optical spectroscopy 
    Kameswara Rao, N; Lambert, D. L; Adams, M. T; Doss, D. R; Gonzalez, G; Hatzes, A. P; James, C. R; Johns-Krull, C. M; Luck, R. E; Pandey, G; Reinsch, K; Tomkin, J; Woolf, V. M (The Royal Astronomical Society, 1999-12)
    A set of high-resolution optical spectra of R CrB acquired before, during and after its 1995-96 decline is discussed. All of the components reported from earlier declines are seen. This novel data set provides new information ...
  • The 1999 Outburst of the Recurrent Nova U Scorpii 
    Anupama, G. C; Dewangan, G. C (The American Astronomical Society, 2000-03)
    The optical spectra of the recurrent nova U Sco obtained in five epochs 0.45-42.35 days after the 1999 outburst maximum are presented here. For the first time, an outburst spectrum of U Sco has been obtained as early as ...
  • 1D radiative transfer models of 21 and 30 μm emission features in proto-planetary nebulae 
    Muthumariappan, C; Reddy, B. E (Cambridge University Press, 2012-08)
    Spectral energy distributions of six proto-planetary nebulae showing 21 and 30μ features were fit with models obtained from 1D radiative transfer code, taking FeO and MgS respectively are the carriers of the features. ...
  • 1–8 Å Coronal Background X-Ray Emission and the Associated Indicators of Photospheric Magnetic Activity 
    Ramesh, K. B; Rohini, V. S (The American Astronomical Society, 2008-10-10)
    Consistent correlations between X-ray background flux (XBF) and sunspot area over three solar cycles suggest a strong relationship between the flux emergence at the locations of strong field regions, sunspots, and the ...
  • 2.5-dimensional solution of the advective accretion disk: a self-similar approach 
    Ghosh, S; Mukhopadhyay, B (Institute of Physics, 2009-02)
    We provide a 2.5-dimensional solution to a complete set of viscous hydrodynamical equations describing accretion-induced outflows and plausible jets around black holes/compact objects. We prescribe a self-consistent advective ...
  • 20" Bhavnagar telescope: a brief history 
    Rajamohan, R; Samson, J. P. A (Indian Institute of Astrophysics, 1984)
  • The 2010 outburst and pre-outburst optical spectrum of the recurrent nova U Scorpii 
    Anupama, G. C; Kamath, U. S; Ramaprakash, A. N; Kantharia, N. G; Hegde, M; Mohan, V; Kulkarni, M; Bode, M. F; Eyres, S. P. S; Evans, A; O Brien, T. J (EDP Sciences, 2013-11)
    Aims. We study the evolution of the recurrent nova U Scorpii during its outburst in 2010. Methods. Optical spectroscopic observations of the nova were obtained during 0.83–162.5 days after outburst maximum. Optical ...
  • 22-year periodicity in solar rotation, solar wind parameters and earth rotation 
    Kirov, B; Georgieva, K; Javaraiah, J (European Space Agency, 2002-12)
    It is generally accepted that the annual variation in the Earth's rotation rate is fully determined by large-scale seasonal changes in atmospheric circulation, while the decadal changes in Earth's rotation have been shown ...
  • 22-year Periodicity in the Solar Differential Rotation 
    Javaraiah, J (Journal of Astrophysics and Astronomy, Vol. 21, No. 3 – 4, pp. 167 - 170, 2000-12)
    Using the data on sunspot groups compiled during 1879- 1975, we determined variations in the differential rotation coefficients A and Β during the solar cycle. The variation in the equatorial rotation rate A is found ...
  • 220 GHz tipping radiometer for monitoring sky opacity at Hanle 
    Ananthasubramanian, P. G; Yamamoto, S; Prabhu, T. P (Astronomical Society of the Pacific, 2002)
    A 220 GHz tipping radiometer is in operation at the Indian Astronomical Observatory, Mt Saraswati, Digpa-ratsa Ri, Hanle (Latitude 32degrees 46' 46".3 N, Longitude 78degrees 57' 51".1 E, Altitude 4500 in above msl) for ...
  • 220 GHz zenith atmospheric transparency at IAO, Hanle 
    Ananthasubramanian, P. G; Yamamoto, S; Prabhu, T. P (Kluwer Academic Publishers., 2002-02)
    We present 220 GHz (1.36 mm) measurements of zenith optical depth obtained to characterise the Indian Astronomical Observatory, Hanle (Ladakh, India) during the period from late December 1999 to early May 2000 and early ...
  • 26 Al Readioactive decay and gamma ray background 
    Sivaram, C (International Cosmic Ray, 1990)
  • 2D radiative equilibrium models of magnetic flux tubes 
    Hasan, S. S; Kalkofen, W; Steiner, O (Kluwer Academic Publishers, 1999)
  • The 3-Dimensional Distribution of Interstellar Dust 
    Murthy, J (Cambridge University Press, 2014-01)
    A knowledge of the three dimensional distribution of interstellar dust is critical in interpreting all observations of the sky, particularly in the understanding of the structure and morphology of our Galaxy. It has been ...
  • 3.0 to 3.5 micron spectrum of V 348 SGR and R CrB 
    Nandy, K; Kameswara Rao, N; Morgan, D. H (D. Reidel Publishing Co, 1986)
    With a view to search for weaker dust spectral features the authors obtained the spectrum of R CrB and V348 Sgr with higher resolution than employed before.
  • The 3.6 metre Devasthal optical telescope: from inception to realization 
    Sagar, R; Kumar, Brijesh; Omar, A (Indian Academy of Sciences, 2019-08-10)
    India’s largest 3.6 metre Devasthal Optical Telescope (DOT) was commissioned in 2016, though the idea of building it germinated way back in 1976. This article provides research accounts as well as glimpses of its nearly ...
  • 3.6-m Devasthal Optical Telescope Project: Completion and first results 
    Kumar, Brijesh; Omar, A; Maheswar, G; Pandey, A. K; Sagar, R; Uddin, W; Sanwal, B. B; Bangia, T; Kumar, T. S; Yadav, S; Sahu, S; Pant, J; Reddy, B. K; Gupta, A. C; Chand, H; Pandey, J. C; Joshi, M. K; Jaiswar, M; Nanjappa, N; Purushottam; Yadav, R. K. S; Sharma, S; Pandey, S. B; Joshi, S; Joshi, Y. C; Lata, S; Mehdi, B. J; Misra, K; Singh, M (Societe Royale des Sciences de Liege, 2018-04)
    We present an update on the 3.6-m aperture optical telescope, which has been installed at Devasthal in the year 2016. In this paper, a brief overview of installation activities at site and first results are presented. The ...
  • 3D Simulations of realistic power halos in magnetohydrostatic sunspot atmospheres: linking theory and observation 
    Rijs, C; Rajaguru, S. P; Przybylski, D; Moradi, H; Cally, P. S; Shelyag, S (IOP Publishing, 2016-01)
    The well-observed acoustic halo is an enhancement in time-averaged Doppler velocity and intensity power with respect to quiet-Sun values that is prominent for the weak and highly inclined field around the penumbra ...
  • 3He Rich Solar Flares 
    Ramadurai, S (Indian Institute of Astrophysics, Bangalore, 1986)
    The various observational features of the 3He rich solar flares like their characteristics and association with other phenomena are discussed. It is shown that 3He rich flares split into two distinct groups, if one plots ...

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