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  • 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 ...
  • Speckle Imaging: a boon for astronomical observations 
    Saha, S. K (Centre for Space Physics, 2003)
    The speckle imaging is a photographic technique that resolves objects viewed through severely distorted media. The results are insensitive to the errors caused by apparent size of the isoplanatic patch and the telescope ...
  • Speckle interferometric observations of close binary stars 
    Saha, S. K; Chinnappan, V; Yeshwanth, L; Anbazhagan, P (Astronomical Society of India, 2002-09)
    Speckle interferometric technique is employed to record a series of hundreds of short-exposure images of several close binary stars with sub-arc second separation through a narrow band filter at the Cassegrain focus of ...
  • Speckle interferometric observations of the collision of comet Shoemaker-Levy 9 with Jupiter 
    Saha, S. K; Rajamohan, R; Vivekananda Rao, P; Sunder, G. S; Swaminathan, R; Lokanandham, B (Astronomical Society of India, 1997)
    Speckle interferometric technique has been used to obtain a series of short exposure images of the collision of comet Shoemaker-Levy 9 with Jupiter during the period of July 17-24, 1994 using the Nasmyth focus of 1.2 meter ...
  • Speckle interferometry at IIA and elsewhere: An overview 
    Venkatakrishnan, P; Saha, S. K; Shevgaonkar, R. K (Tata Institute of Fundamental Reserach, 1988)
    The technique of speckle interferometry, used for compensating the blurring effects of the earth's atmosphere, is briefly outlined. The achievements of this technique by different groups in the world are listed. We then ...
  • Speckle interferometry technique for astronomical observations 
    Saha, S. K (The Optical Society of India, 2003)
  • Spectra of doubly and trebly ionised thallium 
    Narayan, A. L; Pattabhi, P; Rao, A. S (Nature Publishing Group, 1929-09-20)
    CONTINUING our previous work on Tl II and Pb III, the spectra of Tl III and Tl IV have been under examination by us for some time past. A preliminary attempt, by the application of the X-ray doublet-laws, revealed a number ...
  • Spectra of two recent supernovae 
    Prabhu, T. P (Astronomical Society of India, 1981-03)
    Preliminary results on the spectroscopy of two recent supernovae are presented. The spectrograms obtained at a dispersion of 400 Armstrong m/m in the wavelength range of 4300-8700 Armstrong show that the supernova in NGC ...
  • The spectra of Wolf-Rayet stars at high dispersion 
    Bappu, M. K. V (D. Reidel Publishing, 1973)
  • Spectral ageing analysis and dynamical analysis of the double-double radio galaxy J1548–3216 
    Machalski, J; Jamrozy, M; Konar, C (EDP Sciences, 2010-02)
    Context. Determining ages of the outer and the inner lobes of so-called double-double radio galaxies (DDRGs) is crucial for understanding the active cycles of galactic nuclei, the phases of interruption of the jet flow, ...

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