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Browsing Kodaikanal Observatory Bulletins (1905 - 1997 ) by Title

Browsing Kodaikanal Observatory Bulletins (1905 - 1997 ) by Title

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  • F-region oscillations observed during October 24, 1995 solar eclipse at Waltair 
    Rao, B. M; Anhjaneyulu, P (Indian Institute of Astrophysics, Bangalore, 1997)
    Measurements of changes in phase path/Doppler of HF signals on 5.5 MHz from F-region of the ionosphere are carried-out using coherent pulsed Doppler radar. Preliminary analysis of the data show large deviations in phase ...
  • Fabrication of Gradient-Index lens by Ion-Exchange in Glass 
    Masalkar, P. J; Rao, V. V; Sirohi, R. S (Indian Institute of Astrophysics, Bangalore, 1991)
    GRIN lenses have been fabricated using Ag/sup+/ < -- > Na/sup+/ ion-exchange in glass. The fabrication process and characterization of GRIN lenses are discussed. The refractive index profile was studied on the Mach-Zehnder ...
  • Fabry-Perot Interferometric Observations of the Solar Corona in the Green Line 
    Raju, K. P; Singh, J; Muralishankar, S (Indian Institute of Astrophysics, Bangalore, 1997)
    An imaging Fabry-Perot interferometer was designed and used for coronal observations in the green line (FeXIV) 5303 Armstrong. The observations were carried our at Nim Ka Thana, Rajasthan, India during the total solar ...
  • A Fast Optical Pulse Counting system for Crab Pulsar 
    Santhanam, P; Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1985-11)
    A sub millisecond resolution counting system for recording shapes of short periodic pulses is described. Results obtained in recording the shape of optical pulses from Crab pulsar are given here. The flexibility of the ...
  • Fast Photometry Uisng CCD 
    Srinivasan, R; Muralishankar, S; Rajamohan, R (Indian Institute of Astrophysics, Bangalore, 1991)
    Observations of certain objects which exhibit fast changes in their light output seems to be of great interest in optical astronomy. Important informations can be obtained on their internal structures of the stars through ...
  • Field Strength Measurements A-3 Method (Oblique Incidence) at Ahmedabad during Total Solar Eclipse October 1995 
    Lele, P. D; Jani, K. G; Patel, A. P (Indian Institute of Astrophysics, Bangalore, 1997)
    A RACAL-17L communication receiver is used to record signal strength at Ahmedabad on 11.8 MHz transmitted from Colombo. In the initial stages of the eclipse and again towards the ending phase the signal strength showed ...
  • Flow of Gas along a Magnetic field with Time-Dependent Geometry 
    Hasan, S. S; Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1980)
    The flow of gas along a magnetic field with time dependent geometry has been studied. It is seen that the velocity of the flow in the direction of the magnetic field depends both on the magnitude of the velocity of flow ...
  • Fluxvector Splitting of the Inviscid Radiation Gas Dynamic Equations 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1980)
    We have analysed various schemes for the iterative simultaneous solution of the inviscid gas dynamic equations. We have considered the problem from the point of view of the stellar atmospheres. The difference between ...
  • Formation of Spectral Lines with the Redistribution Function R1 along the line of Sight 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1981)
    We studied the formation of spectral lines at infinity with the redistribution function R1. The radial optical depths considered are 5, 5, 10, 50 and 100. A linear law of velocity is assumed in these calculations. Profiles ...
  • Fundamental Flux Tubes in the Solar Magnetic Fields: Generation of the FFT's and the periodic field reversal 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1977)
    It is conceviable that the periodic reversal of the Sun'd large-scale magnetic field and the concentration of the field in strong, thin flux tubes on small scales could bith result from the following likely processes near ...
  • Fundamental Flux Tubes in the Solar Magnetic Fileds: Significance of the Flux-amount; possibility of rising and durability 
    Gokhale, M. H (Indian Institute of Astrophysics, Bangalore, 1977)
    For a satisfactory understanding of the solar magnetic phenomena it may be advantageous first to interrelate phenomenologically observations involving different scales of length and time and in different layers of the solar ...
  • Future X-Ray and Gamma Ray Observations of SN 1987A 
    Marar, T. M. K (Indian Institute of Astrophysics, 1988)
    A brief outline of the prospects for carrying out X-ray and gamma ray observations of SN 1987A in the near future is presented in this paper.
  • Gravitational Waves from Collapsing Stars 
    Sivaram, C (Indian Institute of Astrophysics, 1988)
  • Ground-Level Humidity, Pressure and Temperature Measurements during the October 24, 1995 Total Solar Eclipse 
    Gonzalez, G (Indian Institute of Astrophysics, Bangalore, 1997)
    Measurements of the relative humidity, air pressure, and air temperature were obtained at Nim Ka Thana, India on October 24, 1995 during tht total eclipse of the Sun. Data were also obtained 24 hours previous to the eclipse. ...
  • The He II 5411 Å velocity curve of the Wolf-Rayet eclipsing system HD 214419 
    Giridhar, S (Indian Institute of Astrophysics, 1978)
    A velocity curve of the Wolf-Rayet eclipsing system HD 214419 is obtained from measures on prismatic spectra of the Hell 5411 emission line. The shape of the velocity curve is unlike that obtained for Hell 4686. The emission ...
  • Heating of the Solar Corona 
    Krishan, V (Indian Institute of Astrophysics, Bangalore, 1988)
    The maintenance of the million degree solar corona continues to be a challenging and an inspiring problem. There are basically two different mechanisms of heating depending upon the dominance or otherwise of the magnetic ...
  • Helioseismology 
    Antia, H. M (Indian Institute of Astrophysics, Bangalore, 1988)
    Many of the oscillations observed at the solar surface have been identified with resonant normal modes of the entire solar body. Accurate measurements of frequencies of these modes enable us to study the internal structure ...
  • Helmholtz Resonance Cell for Gas Phase Photoacoustic Studies 
    Ajith Prasad, K. C; Nampoori, V. P. N; Vallabhan, C. P. G (Indian Institute of Astrophysics, Bangalore, 1991)
    The design and frabication of a Helmholtz type gas phase photoacoustic cell are described. The cell which incorporates a miniature microphone (Knowles B.T.1759) along with a matching pre-amplifier is very sensitive and can ...
  • High Energy Photons detection using Scintillation Counter during Total Solar Eclipse of October 24, 1995 
    Jaaffrey, S. N. A; Jain, Rajmal; Pandya, Alok; Bharti, Lokesh (Indian Institute of Astrophysics, Bangalore, 1997)
    We report the first observations of absorption and enhancement in flux of high energy photons during thte total solar eclipse of October 24, 1995. For the purpose of these observations, we employed a scintillation counter ...
  • High Resolution Multislit Spectroscopy of Solar Corona in two lines during the Total Solar Eclipse of Oct. 24, 1995 
    Singh, J; Gupta, S. S; Cowsik, R (Indian Institute of Astrophysics, Bangalore, 1997)
    Two coronal emission lines 5303 Armstrong (Fe XIV) and 6374 Armstrong (Fe X) corresponding to ionization temperatuess of 2 and 1 million degree kelvin respectively were used to obtain the high resolution coronal spectra ...

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