IIA Institutional Repository

Browsing Publications of Astronomical Society of India by Author "Venkatakrishnan, P"

Browsing Publications of Astronomical Society of India by Author "Venkatakrishnan, P"

Sort by: Order: Results:

  • Blind iterative deconvolution of binary star images 
    Saha, S. K; Venkatakrishnan, P (Astronomical Society of India, 1997)
    The technique of Blind Iterative De-convolution (BID) was used to remove the atmospherically induced point spread function (PSF) from short exposure images of two binary stars, HR 5138 and 5747 obtained at the cassegrain ...
  • Imaging with insolated mirrors 
    Venkatakrishnan, P; Sridharan, R; Gupta, S. K (Astronomical Society of India, 2005-09)
    Modern solar telescope designs are different from the conven- tional concept of vacuum telescopes. These new designs are "open" telescopes which try to minimize the temperature difference between various parts of the ...
  • Intensity Changes in Sunspots and Starspots 
    Venkatakrishnan, P (Astronomical Society of India, 1978-12)
  • The Kodaikanal solar vector magnetograph - Laboratory evaluation of the polarimeter 
    Venkatakrishnan, P; Narayanan, R. S (Astronomical Society of India, 1991)
    Laboratory experiments performance to evaluate the sensitivity of the polarimeter of the Kodaikanal vector magnetograph. The polarimeter does not produce significant cross talk and has a sensitivity of about 1 percent polarization
  • Morphology of Ca II K bright points and their link to G band bright points 
    Krishnakumar, V; Venkatakrishnan, P; Srikanth, R (Astronomical Society of India, 2000)
    We present the results of a preliminary analysis of a time series of a sequence of Ca II K bright points and G band bright points observed co-spatially and co-temporally. Inspection of these images shows that the larger ...
  • Multi-aperture solar telescope 
    Venkatakrishnan, P (Astronomical Society of India, 2001)
    A proposal for a new ground based solar telescope of very high angular resolution is presented. The science goals that drive the need for this facility are enumerated. The proposed strategy, of combining several smaller ...
  • On the absorption of He I 10830 Å line by spicules 
    Venkatakrishnan, P; Jain, S. K (Astronomical Society of India, 1983)
    The possible applications of the time-dependent measurements of the equivalent width of the He I 10830 A line for a better understanding of the growth of spicules and the evolution of coronal holes and x-ray bright points ...
  • On the correlation between line width and line depth of the solar HeI 1083 NM line 
    Venkatakrishnan, P; Sakurai, T; Suematsu, Y; Ichimoto, K (Astronomical Society of India, 1997)
    Seven sets of spectra in the region of the HeI 1083 nm absorption line of the active region NOAA 7558 + 7562 near the west limb, obtained at Norikura Solar Observatory, National Astronomical Observatory, Japan have been ...
  • On the Rapid Variations of Solar Magnetic Fields 
    Venkatakrishnan, P; Kumar, B; Ravindra, B (Astronomical Society of India, 2003)
    We report on the rapid variations of solar magnetic fields that appear to be enhanced significantly above the background variability, at a few locations within the solar active regions, as observed with the Michelson Doppler ...
  • Performance Evaluation of Adaptive Optics Systems 
    Sridharan, R; Raja Bayanna, A; Srivastava, N; Kumar, B; Ravindra, B; Gupta, S. K; Jain, N; Ambastha, A; Venkatakrishnan, P (Astronomical Society of India, 2003)
    Adaptive Optics (AO) systems improve the resolution of ground based telescopes and allow for long exposure images. Their performance depends on the seeing conditions at the time of observations. In this paper, we evaluate ...
  • Science from "Solar X-ray Spectrometer (SOXS)" - Proposed payload onboard Indian satellite 
    Jain, R; Rao, A. R; Deshpande, M. R; Dwivedi, B. N; Manoharan, P. K; Seetha, S; Vahia, M. N; Vats, H. O; Venkatakrishnan, P (Astronomical Society of India, 2000)
    It is proposed to fly a high spectral and temporal resolution "Solar X-ray Spectrometer (SOXS)" onboard Indian satellite to understand the mechanisms of energy release and particle acceleration in solar flares. The SOXS ...
  • Synchronization in binary stars 
    Rajamohan, R; Venkatakrishnan, P (Astronomical Society of India, 1981-12)
    Radiative dissipation of the dynamical tide is found to be inadequate in explaining the observed synchronization between orbital and rotational motions of the main sequence components of early-type binary stars. The ...
  • Wave propagation in solar magnetic tubes 
    Venkatakrishnan, P (Astronomical Society of India, 1981-09)
    The work done on propagation of waves in magnetic tubes is reviewed. It is seen that majority of the results obtained so far are based on the thin tube approximation. It is shown that estimates of the mechanical energy ...

Search DSpace


Browse

My Account