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Browsing Kodaikanal Observatory Publications by Title

Browsing Kodaikanal Observatory Publications by Title

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  • Reconstruction of Solar Features from an Image of Partially Eclipsed Sun 
    Krishnakumar, V; Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1997)
    The photoheliograms obtained at Kodaikanal during the partial eclipse of the Sun on October 24, 1995 were digitised on a PDS microdensitometer. The lunar limb was used as a standard source for the digital reconstruction ...
  • Record of extended corona using colour video 
    Saxena, A. K; Samson, J. P. A; Lancelot, J. P (Indian Institute of Astrophysics, Bangalore, 1997)
    The entire event of the total solar eclipse of October 24 1995 was vediographed at our Kalpi camp. We have used SONY handy cam Video 8 Model No. CCD FX 280E PAL attached with 12x variable zoom lens. Partial eclipse was ...
  • Reduction of Photoheliograms by IBM-PC controlled digitizer 
    Ambastha, A (Indian Institute of Astrophysics, Bangalore, 1988)
    A method is described here to determine heliographic coordinates of sunspots on a photoheliogram using an IBM-PC controlled digitizer. Sunspot proper-motions and buildup of magnetic energy in solar active regions may be ...
  • Reflection Nebula in the Far Ultraviolet: Icy Grains 
    Shah, G. A; Krishna Swamy, K. S (Indian Institute of Astrophysics, Bangalore, 1978)
    Some models of the reflection nebula in the form of homogeneous plane parallel slab containing singly scattering dirty ice grains as test case have been given. The three geometric cases of the star behind, within and in ...
  • Reflection nebula in the far-ultraviolet. 2. Silicate and graphite grains 
    Shah, G. A; Krishna Swamy, K. S (Indian Institute of Astrophysics, 1979-11)
    Simple models of the reflection nebula in the form of homogeneous plane-parallel slab containing single scattering silicate and graphite grains taken one species at a time have been considered in view of the far-ultraviolet ...
  • Relativistic effects on Radiative Transfer Equation: Order of Magnitude study 
    Peraiah, A (Indian Institute of Astrophysics, Banglore, 1986-05)
    We have analyzed how the high gas velocities which are observed in the objects such as the atmospheres of supergiant stars, novae, supernovae, accretion discs around high density objects (like black holes, neutron stars ...
  • Report on observations during total solar eclipse of October 24, 1995 
    Makarov, V. I; Erchov, V. N (Indian Institute of Astrophysics, 1997)
    The solar eclipse -95 took place during the minimum of sunspots and in the period of high level of polar activity of the Sun. we planned to observe the polar coronal structures in order to study the magnetic field in polar ...
  • Report on the conditions for Astronomical work in Kashmir 
    Evershed, John (Indian Institute of Astrophysics, Bangalore, 1914-09-22)
  • Report on the experiments during total solar eclipse of October 24, 1995 
    Subramaniam, R (Indian Institute of Astrophysics, 1997)
    The several experiments carried out by the M. P. Birla Planetarium were undertaken by two teams of scientists. One stationed south of planned and the other at Diamond Harbour, near Calcutta. The team at Allahabad ...
  • Response of the small-scale dynamics of lower F-region plasma over Kodaikanal to the total solar eclipse of October 24, 1995 
    Visweswara Rao, J. V. S; Sastri, J. H (Indian Institute of Astrophysics, Bangalore, 1997)
    Continuous and high-time resolution recording of the changes in phase path (Doppler frequency shift) of lower F-region reflections over Kodaikanal were made in the forenoon on October 24, 1995 and on several days prior to ...
  • Results of the October 24, 1995 Solar Eclipse Balloon Experiments from Thumba 
    Appu, K. S; Santhikumar, K. S; Padmanabha Pillai, R; Narayanan, V; Chandrasekharan, C. K (Indian Institute of Astrophysics, Bangalore, 1997)
    Nine high-altitude meteorological radiosonde balloon ascents were conducted from Thumba and Trivandrum during 23rd - 25th October, 1995 to study the partial solar eclipse induced variations of the temperature and winds in ...
  • Rib Waveguide polarizer in GaAs/AlGaAs 
    Gupta, V. L; Sharma, E. K; Tripathi, K. N; Srivastava, G. P (Indian Institute of Astrophysics, Bangalore, 1991)
    Metal clad wave guides have an extremely large differential attenuation of TE and TM states of polarization and can be used to design efficient intergrated polarizers. Described here is a AlGaAs rib wave guide polarizer ...
  • 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 ...

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