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  • Southern hemisphere solar radio heliograph 
    Sawant, H. S; Fernandes, F. C. R; Neri, J. A. C. F; Cecatto, J. R; Faria, C; Stephany, S; Rosa, R. R; Andrade, M. C; Ludke, E; Subramanian, K. R; Ramesh, R; Sundrarajan, M. S; Sankararaman, M. R; Ananthakrishnan, S; Swarup, G; Boas, J. W. V; Botti, L. C. L; Moron, C. E; Saito, J. H; Karlicky, M (European Space Agency, 2002-12)
    The Brazilian Decimetric Array (BDA) is being developed at National Institute for Space Research (INPE) as an international collaborative program. Initially, the BDA will operate in the tuneable frequency range of 1.2-1.7 ...
  • 'A space walk is like doing a ballet' 
    The Hindu (The Hindu, 2008-08-13)
  • Space Weather – Sun Earth Relations 
    Sundararaman, K (Scientific Research Publishing, 2011-03)
    Sun, a star of spectral type G2 is the main source of energy to the Earth. Being close to the Earth, Sun pro-duces a resolvable disk of great detail, which is not possible for other stars. Solar flares and coronal mass ...
  • Spaceborne ultraviolet 251-384 nm spectroscopy of a meteor during the 1997 Leonid shower 
    Jenniskens, P; Tedesco, Ed; Murthy, J; Laux, C. O; Price, S (Wiley, 2002-08)
    We used the ultraviolet to visible spectrometers onboard the midcourse space experiment to obtain the first ultraviolet spectral measurements of a bright meteor during the 1997 Leonid shower. The meteor was most likely a ...
  • Spacetime curvature, rotation and the pulse profile of fast pulsars 
    Datta, B; Kapoor, R. C (Astronomical Society of India, 1985-09)
    Propagation of photons in the spacetime exterior to a rapidly rotating neutron star is investigated, using a rotationally perturbed spherical metric, to determine the pulse profile of fast pulsars. We find that spacetime ...
  • The spatial and temporal evolution of gas and heavy elements in the galaxy 
    Basu, S (Astronomical Society of India, 1993)
  • Spatial damping of compressional MHD waves in prominences 
    Singh, K. A. P; Dwivedi, B. N; Hasan, S. S (EDP Sciences, 2007-10)
    Aims.We study the spatial damping of linear compressional MHD waves in a homogeneous, isothermal, and unbounded prominence. Methods.We derive a general dispersion relation invoking the Newtonian radiation and turbulent ...
  • Spatial distribution of molecules and dust within the coma of Comet Halley 
    Sivaraman, K. R; Babu, G. S. D; Shylaja, B. S; Rajamohan, R (European Space Agency, 1986-12)
    Spectral scans of comet Halley were made at high spatial resolution using the Cassegrain focus (f/13) of the 102 cm reflector at Kavalur (India). The scans cover the wavelength region from 3900 to 6200 A and at 40 A ...
  • Spatial Distribution of Stellar Mass in the Large Magellanic Cloud Star Clusters 
    Subramaniam, A; Sagar, R; Bhatt, H. C (European Southern Observatory, 1993-06)
    The stellar mass distributions have been studied in halo regions (radius ranging from ~19 to 94 arcsec) of 5 young Large Magellanic Cloud star clusters. Effects of mass segregation have been observed in only NGC 1711. A ...
  • Spatial distribution of Unidentified Infrared emission Bands in star forming regions 
    Ghosh, S. K; Ojha, D. K (Astronomical Society of India, 2002-09)
    Midcourse Space Experiment (MSX) has surveyed the Galactic plane in four infrared bands between 6 and 25 /Lm, two of which cover several Unidentified Infrared emission Bands (UIBs). A scheme has been developed to extract ...
  • Spatial light modulator for wave-front correction 
    Vyas, A; Roopashree, M. B; Banyal, R. K; Prasad, B. R (Department of Applied Optics and photonics, University of Calcutta, 2009)
    We present a liquid crystal method of correcting the phase of an aberrated wave-front using a spatial light modulator. A simple and efficient lab model has been demonstrated for wave-front correction. The crux of a wave-front ...
  • Spatial profiles of lines in active region loops 
    Krishan, V (Springer, 1983-10)
    From the statistical treatment of magnetohydrodynamically turbulent plasma, a steady-state density, temperature and magnetic field structure is derived for a coronal loop emitting in UV and EUV range. Spatial variation of ...
  • Spatial, Seasonal and Solar Cycle characteristics of the Loss Coefficient in Ionospheric F-region 
    Bhargava, B. N; Subrahmanyan, R. V (Indian Meteorological Department, 1964)
    Evaluations of loss coefficient at several fixed heights of ionospheric F-region by a comparatively simple method have been shown to yeild reasonable values. Seasonal characterstics of the loss coefficient have been obtained ...
  • Spatially resolved images and solar irradiance variability 
    Kariyappa, R (Springer, 2008-03)
    The Sun is the primary source of energy that governs both the terrestrial climate and near-earth space environment. Variations in UV irradiances seen at earth are the sum of global (solar dynamo) to regional (active region, ...
  • A spatio-kinematic study of the planetary nebula NGC 246 in the [OIII] 5007 Å line 
    Muthumariappan, C; Anandarao, B. G (Astronomical Society of India, 1999)
  • Spatio-temporal fluctuations in He I 10830 A line parameters - Evidence for spicule formation 
    Venkatakrishnan, P; Jain, S. K; Singh, J; Recely, F; Livingston, W. C (Springer Netherlands, 1992-03)
    The equivalent width, line depth, line width, and Doppler shift of the He i 10830 Å line were extracted from two time series of spectra. Scatter plots of time-averaged line depth, line width, and Doppler shifts, as well ...
  • Spatiotemporal map of star clusters in the Magellanic Clouds using Gaia: synchronized peaks and radial shrinkage of cluster formation 
    Dhanush, S. R; Subramaniam, A; Nayak, Prasanta K; Subramanian, S (Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
    We present a detailed view of cluster formation (CF) to trace the evolution and interaction history of the Magellanic Clouds (MCs) in the last 3.5 Gyr. Using the Gaia DR3 data, we parametrized 1710 and 280 star clusters ...
  • Speckel Interferometry of SN 1987A and the "Mystery Spot" 
    Nityananda, Rajarama (Indian Institute of Astrophysics, 1988)
    Two groups have independently studied SN1987A by the technique of optical speckle interferometry in the visible region of wavelengths about a month after the explosion. Both detect a secondary source a factor of ten fainter ...
  • A Speckle Experiment during the Partial Eclipse 
    Saha, S. K; Nagabhushana, B. S; Ananth, A. V; Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1997)
    An experiment for the speckle reconstruction of solar features was developed for observing the partial eclipse of the sun as viewed from Bangalore on October 24, 1995. No data could be obtained because of cloudy sky but ...
  • Speckle imaging with hypertelescopes 
    Surya, A; Saha, S. K; Labeyrie, A (Oxford University Press on behalf of the Royal Astronomical Society, 2014-09-01)
    Optical stellar interferometers have demonstrated milliarcsecond resolution with few apertures spaced hundreds of metres apart. To obtain rich direct images, many apertures will be needed, for a better sampling of the ...

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