IIA Institutional Repository

Browsing Kodaikanal Observatory Publications by Title

Browsing Kodaikanal Observatory Publications by Title

Sort by: Order: Results:

  • RII partial frequency redistribution function and its effects on the formation of lines in expanding spherical atmospheres 
    Peraiah, A (Indian Institute of Astrophysics, 1979-11)
    The redistribution in frequency in lines formed in atmospheres in which the matter is moving radially outwards with velocity gradients is studied in the rest frame of the star. We velocity gradients is studied in the rest ...
  • The role of Lorentz force in the evolution of the circum-solar dust band 
    Satheesh Kumar, A; Isobe, S (Indian Institute of Astrophysics, 1997)
    The charging processes of the dust particles in the near- solar regions, and the effects of the Lorentz force acting on such particles have been analyzed. It is found that the Lorentz force is capable of either forcing the ...
  • The Rotation of the Sun from Mount Wilson Sunspot Mesurements 
    Howard, Robert; Gilman, Peter (Indian Institute of Astrophysics, Bangalore, 1984)
  • Rotational Effects in SN 1987A 
    Ramadurai, S; Wiita, Paul J (Indian Institute of Astrophysics, 1988)
    The possible evolutionary effects of rotation on the observational characteristics of SN 1987A and it progenitor Sk -69 202, are explored. If rotation is important, decrease in post main sequence luminosity and increase ...
  • Rotational Effects on line Source Function 
    Peraiah, A; Raghunath, G (Indian Institute of Astrophysics, Bangalore, 1980)
    The effects of rotation are investigated on the source functions in an expanding atmosphere. We have considered a non-LTE two-level atom in an extended atmosphere. We have also made use of von Zeipel`s theorem in giving ...
  • Search for Hydrogen-alpha Emitting Cool Pockets in Corona During the Total Solar Eclipse of October 24, 1995 
    Cowsik, R; Singh, J; Raju, K. P; Saxena, A. K; Samson, J. P. A; Naidu, B. N (Indian Institute of Astrophysics, Bangalore, 1997)
    Narrow pass band hydrogen alpha filtergrams were obtained during totality at Kalpi, to look for cool pockets of H-alpha emission in corona first observed by Bappu and Bhattacharyya during the 1970 Mexican eclipse observations. ...
  • Search for Mechanisms of Solar Magnetism 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1986)
    Study of 'Solar magnetism' (totality of solar magnetic phenomena on idfferent scales) and its 'mechanisms' (physical processes responsible for the phenomena) is obviously essential for the advancement of solar and ...
  • A Simple Digital System Drive for Small Telescopes 
    Bhattacharyya, J. C; Ramamoorthy, K. S; Chandramohan, R (Indian Institute of Astrophysics, Bangalore, 1980)
    A variable stable frequency source employing a crystal oscillator and a programmable digital divider chain is described. The system offers an ideal arrangement for controlling tracking rates of small and medium size ...
  • Simultaneous Solution of Radiative Transfer Equation in the Comoving Frame and the Statistical Equilibrium Equation with Complete Redisribution 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1980)
    Complete redistribution with Voigt profile function has been employed in obtaining the simultaneous solution of line transfer and the statistical equilibrium equation for a non-LTE two level atom in an extended stellar ...
  • A Single-Cell Photopolarimeter 
    Jain, S. K; Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1987-02)
    A simple, single-cell photopolarimeter has been developed for use at the cassegrain focus of the 102 cm Ritchey-Chretien reflector at Kavalur. The design and performance of the instrument are discussed
  • SN 1987A : Light Curves and Inferences 
    Prabhu, T. P (Indian Institute of Astrophysics, 1988)
    The UBVRI light curves of SN 1987a are described. The inferences one can draw from these data, such as the colour evolution, evolution of photospeheric radius and temperature, and bolometric light curve, are discussed. ...
  • SN1987A : Supernova Remnant Prospects 
    Velusamy, T (Indian Institute of Astrophysics, 1988)
  • A Sol-Gel Derived AR coating on Ophthalmic Lenses in the Visible Region 
    Biswas, P. K; Atta, A. K; Ganguli, D (Indian Institute of Astrophysics, Bangalore, 1991)
    Deposition of antireflective coating in the visible region by the sol-gel spinning technique has been described in this communication. A 2-layer design, centred at 550 nm, was used. The design can be denoted as Glass/H/L/Air ...
  • Solar activity 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1988)
    Sun could have had a nice and perfect spherical symmetry in its atmosphere and probably no variations on time scales smaller than hundreds of thousands of years if (i) the energy produced in its core could be transported ...
  • Solar and Stellar Convection 
    Narasimha, D (Indian Institute of Astrophysics, Bangalore, 1988)
    The flow field in stellar convection zones, characterised by high Rayleigh number, low Prandtl number and large Reynolds number, is time dependent and turbulent, consisting of eddies having a range of scale-lengths upto ...
  • Solar Convection and Oscillations 
    Chitre, S. M (Indian Institute of Astrophysics, Bangalore, 1986)
    A wide variety of gravity and acoustic wave motions have been detected at the surface of the Sun as Doppler shifts of spectral lines. These velocity field provide a valuable probe for studying the internal solar structure ...
  • The solar corona in the He II line 
    Shylaja, B. S (Indian Institute of Astrophysics, 1997)
    The corona of the sun was photographed with the filters centered at 4686Å, 4921 Å and 5812 Å, on 24th October 1995, during totality at Nim Ka Thana The PDS scans of these Images were presented The differences In the contours ...
  • Solar Dynamo Problem 
    Gokhale, M. H (Indian Institute of Astrophysics, Banglore, 1984)
    The origin of solar magnetic field and the flux tube nature of this field on the smallest observed scales are two key problems in solar magnetohydrodynamics. Despite the sucess of kinematical models based on the turbulent ...
  • Solar Eclipse and its effect on Epilepsy 
    Sheji, P (Indian Institute of Astrophysics, Bangalore, 1997)
    A study was conducted at the Indian Epilepsy foundation to investigate the possibility of seizure being precipitated by the solar eclipse viewed on October 24, 1995. 47 known epileptic parient were included under the ...
  • Solar magnetic field and rotation 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1988)
    Sun’s highly inhomogeneous asymmetrical, and time dependent magnetic field plays a vital role in the non-Radiative energy transport that maintains the inhomogeneous asymmetrical and time dependent atmosphere of the sun ...

Search DSpace


Browse

My Account