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Browsing Kodaikanal Observatory Bulletins (1905 - 1997 ) by Title

Browsing Kodaikanal Observatory Bulletins (1905 - 1997 ) by Title

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  • Thickness Dependence of the Optical properties of Vacuum Evaporated YF3 Thin Films 
    Satyamoorthy, R; Narayandass, Sa. K; Balasubramanian, C; Mangalaraj, D (Indian Institute of Astrophysics, Bangalore, 1991)
    Rare earth oxides and fluorides are well known for their refractory nature and chemical stability and so they find considerable application in electronic and optical devices. The present investigation deals with the optical ...
  • Total solar eclipse observations MiG-25 at 80,000 ft 
    Bhatnagar, A; Mukerji, S; Babu, Y. S; Sehgal, N. K; Kamble, V. B; Pandya, R. P; Pandya, N. P; Bhavsar, K. M; Prajapati, R. P (Indian Institute of Astrophysics, 1997)
    The objective of this project was to take intensity and polarization measurements of extended solar coronal streamers, from a height of 75,000 to 80,000 feet above the ground. Hitherto, no observations have been made of ...
  • Transient Solution of Equations of Hydrodynamics in Gas Clouds 
    Peraiah, A (Indian Institute of Astrophysics, 1981)
    We have presented numerical results of transient phenomenon in incompressible fluids. This has been obtained by solving the equations of conservation of momentum, energy and mass in X and Y geometry. We have used the explict ...
  • The two components of the solar activity cycle as a consequence of the shock transition model of the solar magnetic cycle 
    Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)
    Justification is given for comparing the consequences of the shock transition model of the solar magnetic cycle with important observed properties of the solar activity cycle without waiting for the basic postulates of the ...
  • Two ribbon flare on April 3, 1980 
    Jain, Rajmal (Indian Institute of Astrophysics, Bangalore, 1988)
    H alpha observations of a two ribbon (TR) flare which were associated with exceptionally high microwave (MW) and hard X-ray emissions are presented and discussed. The good spatial and temporal resolution of the H alpha ...
  • Type-I Solar Radio Bursts 
    Gopalswamy, N (Indian Institute of Astrophysics, Bangalore, 1986)
    A brief review of the recent work done on Type-I radio emission in the Indian Institute of Astrophysics is presented. The most plausible low frequency turbulence needed to generate the type-I bursts is shown to be ion-sound ...
  • Ultra-low dispersion spectroscopy of stars and galaxies 
    Bappu, M. K. V; Parthasarathy, M (Indian Institute of Astrophysics, Bangalore, 1977)
    Application of ultra-low dispersion spectroscopy (10.000 Å mm-1) is described to study the nuclei of elliptical galaxies, the quassi - stellar objects and for the discovery of faint OB stars, reddened stars and red stars. ...
  • Ultra-low Spatial Resolution Photometry in Near-infrared to Detect the Solar Dust Ring 
    Singh, J; Cowsik, R; Raju, K. P; Mohin, S; Ravi, K (Indian Institute of Astrophysics, Bangalore, 1997)
    There are conflicting reports about the existence of the dust ring around the Sun. An experiment to detect the solar dust ring was performed by IIA group during the total solar eclipse of Oct. 24, 1995. A near-infrared ...
  • Use of Lasers in Satellite to Earth Communication Link 
    Sundar Kumar Iyer, S; Mukunda Rao, M (Indian Institute of Astrophysics, Bangalore, 1991)
    With the growing demand of communication requirement all over the world, there is no way out to go in for higher carrier frequencies. A far sighted move be to in for laser communication links in areas like earth to satellite ...
  • Variation of light intensity during the total solar eclipse 
    Dutta, A (Indian Institute of Astrophysics, Bangalore, 1997)
    The variation of light intensity was recorded at Birla Industrial & technology Museum, Calcutta using a moving coli galvanometer and LDR on the eclipse day and one day prior to the eclipse. It was found that there was a ...
  • Vector Magnetic Field in Prominences: Observations and Analysis 
    Smartt, R. N; House, L. L (Indian Institute of Astrophysics, Bangalore, 1984)
    Measurements of the polarization of the He I D3 multiplet in a prominence allow the magnetic fields associated with the prominence to be deduced. The amount and angle of the linear polarization are governed by the Hanle ...
  • Video recording of the flash spectrum during the total solar eclipse October 24, 1995 
    Trivedi, P; Guruprasad, R; Radhakrishnan, R. S (Indian Institute of Astrophysics, Bangalore, 1997)
    Flash spectra were recorded at video rate from Behind, Madhya Pradesh A holographic transmission grating, was used in front of a CCD video camera. Using a. solar Image of 0 5mm diameter, the spectrum on the CCD was recorded ...
  • Violet absorption edges of C IV lines in Wolf-Rayet spectra: possible superposition with diffuse interstellar bands at 5780 Å and 5797 Å 
    Giridhar, S; Bappu, M. K. V (Indian Institute of Astrophysics, 1978)
    It is shown that the violet edges normally seen in Wolf-Rayet stars around 5800Å are principally due to displaced C IV absorption. The diffuse interstellar bands are seldom of comparable strength and can be seen separately ...
  • Why is geomagnetic activity during the ending years of a solar cycle well correlated to the maximum of the next cycle? 
    Gokhale, M. H (Indian Institute of Astrophysics, 1979-11)
    The two component nature of the solar activity cycle as resulting from the shock-transition model of the solar magnetic cycle, provides for a correlation between a measure of coronal hole formations during the ending years ...
  • Widened lines in sunspot spectra 
    Smith, C. M (Director Kodaikanal Observatory, 1904-11)
  • Widened lines in sunspot spectra 
    Smith, C. M (Director Kodaikanal Observatory, 1905-11-30)
  • Widened lines in sunspot spectra 
    Smith, C. M (Director Kodaikanal Observatory, 1906-06-16)
  • Widened lines in sunspot spectra 
    Smith, C. M (Director Kodaikanal Observatory, 1906-11-24)
  • Widened lines in sunspot spectra 
    Evershed, John (Director Kodaikanal Observatory, 1907-07-02)
  • The Wolf-Rayet Spectrscopic Binary HD 214419 
    Bappu, M. K. V; Visvanadham, P (Indian Institute of Astrophysics, Bangalore, 1977)
    Velocity curves of the system HD 214419 are obtained for the N IV 4058 and He II 4686 emission lines from prismatic spectra taken in 1951 and 1952. The emission and absorption features experience several phase dependent ...

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