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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Seeing measurements with the Merak Hα Telescope 
    Vishnu, Unni. C; Sridharan, R; Ravindra, B; Prabhu, K (Springer, 2021-04)
    The parameter-search method (PSM) established by Rengaswamy, Ravindra, and Prabhu (Solar Phys.294, 5, 2019) for measuring the terrestrial atmospheric seeing from long-exposure solar Hα images is further validated - through ...
  • Segmentation of Coronal Features to Understand the Solar EUV and UV Irradiance Variability 
    Kumara, S. T; Kariyappa, R; Zender, J. J; Giono, G; Delouille, V; Pradeep Chitta, L; Dame, L; Hochedez, J. F; Verbeeck, C; Mampaey, B; Doddamani, V. H (EDP Sciences, 2014-01)
    Context. The study of solar irradiance variability is of great importance in heliophysics, the Earth’s climate, and space weather applications. These studies require careful identifying, tracking and monitoring of active ...
  • Segmentation of Coronal Features to Understand the Solar EUV and UV Irradiance Variability III. Inclusion and Analysis of Bright Points 
    Zwaard, Rens van der; Bergmann, Matthias; Zender, ·Joe; Kariyappa, R; Giono, Gabriel; Dame, Luc (Springer, 2021-09)
    The study of solar irradiance variability is of great importance in heliophysics, Earth’s climate, and space weather applications. These studies require careful identifying, tracking and monitoring of features in the solar ...
  • Segregation of dust and abundance inhomogeneities in globular clusters 
    Bhatt, H. C (Royal Astronomical Society, 1988-08)
    Segregation of dust in globular cluster protoclouds is considered as a possible mechanism for producing the observed heavy element abundance inhomogeneities within globular clusters. Segregation of dust towards the protocloud ...
  • The SEGUE Stellar Parameter Pipeline. IV. Validation with an Extended Sample of Galactic Globular and Open Clusters 
    Smolinski, J. P; Lee, Y. S; Beers, T. C; An, D; Bickerton, S. J; Johnson, J. A; Loomis, C. P; Rockosi, C. M; Sivarani, T; Yanny, B (IOP Publishing, 2011-03)
    Spectroscopic and photometric data for likely member stars of five Galactic globular clusters (M3, M53, M71, M92, and NGC 5053) and three open clusters (M35, NGC 2158, and NGC 6791) are processed by the current version of ...
  • The SEGUE Stellar Parameter Pipeline. V. Estimation of Alpha-element Abundance Ratios from Low-resolution SDSS/SEGUE Stellar Spectra 
    Lee, Y. S; Beers, T. C; Prieto, C. A; Lai, D. K; Rockosi, C. M; Morrison, H. L; Johnson, J. A; An, D; Sivarani, T; Yanny, B (IOP Publishing, 2011-03)
    We present a method for the determination of [α/Fe] ratios from low-resolution (R = 2000) SDSS/SEGUE stellar spectra. By means of a star-by-star comparison with degraded spectra from the ELODIE spectral library and with a ...
  • Seismic and spectroscopic characterization of the solar-like pulsating CoRoT target HD 49385 
    Deheuvels, S; Bruntt, H; Michel, E; Barban, C; Verner, G; Régulo, C; Mosser, B; Mathur, S; Gaulme, P; Garcia, R. A; Boumier, P; Appourchaux, T; Samadi, R; Catala, C; Baudin, F; Baglin, A; Auvergne, M; Roxburgh, I. W; Pérez Hernández, F (EDP Science, 2010-06-11)
    Context. The star HD 49385 is the first G-type solar-like pulsator observed in the seismology field of the space telescope CoRoT. The satellite collected 137 days of high-precision photometric data on this star, confirming ...
  • Seismic imaging of crust beneath the Dharwar Craton, India, from ambient noise and teleseismic receiver function modelling 
    Borah, K; Rai, S. S; Prakasam, K. S; Gupta, S; Priestley, K; Gaur, V. K (Oxford University Press on behalf of the Royal Astronomical Society, 2014-05)
    We use cross-correlation of continuous 18 months (2009 February to 2010 August) ambient noise data recorded over 35 broad-band seismographs in the Archean Dharwar Craton and the adjoining granulite terrain to generate ...
  • A seismic model of the solar convective envelope 
    Shibahashi, H; Hiremath, K. M; Takata, M (International Astronomical Union, 1998)
    We deduce the density, pressure, and temperature profiles in the solar convective envelope by solving the basic equations for mass conservation and the hydrostatic equilibrium with the imposition of the helioseismologically ...
  • Seismic rays, satellites and sea winds 
    Gaur, V. K; Sujata Varadarajan (Indian Academy of Sciences, 2010-11)
    This section features conversations with personalities related to science, highlighting the factors and circumstances that guided them in making the career choice to be a scientist
  • Seismic signatures of the Pan-African orogeny: implications for southern Indian high-grade terranes 
    Rai, A; Gaur, V. K; Rai, S. S; Priestley, K (Blackwell Publishing, 2009-02)
    We present the results of a study designed to investigate and compare the seismic characteristics of the once contiguous terranes of eastern Gondwanaland, now incorporated in five separated continental masses, which, during ...
  • Seismic solar model: both of the radiative core and the convective envelope 
    Shibahashi, H; Hiremath, K. M; Takata, M (Elsevier, 1999)
    We determine the solar internal structure by solving the basic stellar structure equations with the imposition of the sound speed, which is inferred from helioseismology. As for the radiative core, all the four structure ...
  • Seismology of the solar corona through observations of metric type IV radio burst emission 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A (Anita Publications, 2004)
    We present metric radio observation of a transient. quasi-periodic type IV burst emission from the solar corona following the hard X-ray/H¦Á flare of November 23, 2000. The radio event lasted for about 121s, and the ...
  • Seismology of the Sun: Inference of Thermal, Dynamic and Magnetic Field Structures of the Interior 
    Hiremath, K. M (Springer, 2013-08)
    Recent overwhelming evidences show that the sun strongly influences the Earth’s climate and environment. Moreover existence of life on this Earth mainly depends upon the sun’s energy. Hence, understanding of physics of the ...
  • Self organization in quasi two-dimensional hydrodynamic flows 
    Satya Narayanan, A (The Royal Swedish Academy of Sciences, 1993-06)
    The cascading characteristics of the invariants of 2D and 3D hydrodynamically turbulent media are well known. Analogous to the 2D case, here we set up a variational principle for the 3D case by invoking the differential ...
  • Self-organization processes in astrophysics 
    Krishan, V (Indian Association for the Cultivation of Science, 1992)
  • Self-organization processes on the sun - The heliosynergetics 
    Krishan, V; Mogilevskij, E. I (International Astronomical Union, 1990)
    A study by Levich and Tzvetkov (1985) is used to construct a model of solar granulation in its entirety. Solar granulation on all scales and the formation and evolution of some structures in active solar regions are ...
  • A Sensitive Search for Supernova Emission Associated with the Extremely Energetic and Nearby GRB 221009A 
    Srinivasaragavan, Gokul P; O'Connor, Brendan; Bradley Cenko, S; Dittmann, Alexander J; Yang, Sheng; Sollerman, Jesper; Anupama, G. C; Barway, Sudhanshu; Bhalerao, Varun; Kumar, Harsh; Swain, Vishwajeet; Hammerstein, Erica; Holt, Isiah; Anand, Shreya; Andreoni, Igor; Coughlin, Michael W; Dichiara, Simone; Gal-Yam, Avishay; Coleman Miller, M; Soon, Jaime; Soria, Roberto; Durbak, Joseph; Gillanders, James H; Laha, Sibasish; Moore, Anna M; Ragosta, Fabio; Troja, Eleonora (American Astronomical Society, 2023-06-01)
    We report observations of the optical counterpart of the long gamma-ray burst GRB 221009A. Due to the extreme rarity of being both nearby (z = 0.151) and highly energetic (Eγ,iso 1054 erg), GRB 221009A offers a unique ...
  • Sensitivity of the Calculated g-Mode Frequencies to Pulsation Codes and their Parameters 
    Moya, A; Mathur, S; García, R. A (Springer, 2011-02)
    From the recent work of the Evolution and Seismic Tools Activity (ESTA: Monteiro et al., ESA, SP-1306, 363 – 371, 2006 and Lebreton et al., Astrophys. Space Sci. 316, 1 – 12, 2008), whose Task 2 is devoted to comparing ...
  • Sensors for the high resolution astronomical imaging 
    Saha, S. K (Macmillan Publishers India Ltd., 2008)
    Optical interferometry with single aperture, as well as with multi-aperture require high quality sensor that enables to obtain snap shots with a very fast time resolution of the order of (i) frame integration of 50 Hz, or ...

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