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Browsing Kodaikanal Observatory Bulletins (1905 - 1997 ) by Title

Browsing Kodaikanal Observatory Bulletins (1905 - 1997 ) by Title

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  • The Absolute Magnitudes of Wolf-Rayet Stars HD 151932 and HD 152270 
    Shylaja, B. S; Bappu, M. K. V (Indian Institute of Astrophysics, Bangalore, 1983)
    The absolute visual magnitudes of two Wolf-Rayet stars HD 151932 (WN 7) and HD 152270 (WC 7+08) have been determined from their energy distributions and monochromatic magnitudes least contaminated by emission lines taking ...
  • Active prominences and associated terrestrial effects 
    Narayana, J. V (Government Observatory, Madras, 1963-10)
  • An Analog System for Fast Light Curve Registration 
    Bhattacharyya, J. C; Sundareswaran. A (Indian Institute of Astrophysics, Bangalore, 1977)
    An electronic system for recording fast light curves is described. The system employs a two track magnetic tape recorder for intermediate storage of photometer and time signals and reproduces these on cathode ray oscilloscope ...
  • An analysis of Babinet compensator fringes using Jones calculus 
    Pandya, T. P; Saxena, A. K (Indian Institute of Astrophysics, 1978)
    Following Jones Calculus, a comprehensive theory of the Babinet Compensator has been presented. The performance of the system governed by the compensator-Polaroid unit, has been evaluated in terms of fringe visibility. ...
  • Anomalous Behaviour of 22.3 kHz NWC Signal during Total Solar Eclipse of October 24, 1995 
    De, B. K; Sarkar, S. K (Indian Institute of Astrophysics, Bangalore, 1997)
    The effect of total solar eclipse of October 24, 1995 on long distance VLF radio wave propagation of 22.3 kHz from North West Cape, Australia to Calcutta is being reported here. After the commencement of the total eclipse ...
  • Anomalous dispersion in the sun 
    Royds, T (Indian Institute of Astrophysics, Bangalore, 1915-10-29)
  • The apparent effect of planets on the distribution of prominences 
    Royds, T; Sitarama Ayyar, S (Indian Institute of Astrophysics, Bangalore, 1913-11-15)
  • Application of Spectroscopic Ellipsometry to Study the Effect of Annealing on Cadmium Sulphide Thin Films 
    Mathew, Sunny; Vijayakumar, K. P (Indian Institute of Astrophysics, Bangalore, 1991)
    Multiple angle spectroscopic ellipsometery (SE) has been used to study the variation in the layer structure due to annealing of CdS thin films prepared by spray pyrolysis technique. The samples were studied using visible ...
  • ASPEN Workshop on Supernova Physics 
    Ramadurai, S (Indian Institute of Astrophysics, 1988)
  • An Aspheric Grin Ray Trace Program for Thermal Analysis of Optical Systems 
    Sharma, D. K; Shyam, D; Sujatha, G (Indian Institute of Astrophysics, Bangalore, 1991)
    In this communication we describe a program which can ray trace through systems bounded by spherical/ aspheric surfaces together with the option to trace through media having graded index profile (GRIN) for one or more ...
  • The astronomical seeing at Kavalur. 
    Bappu, M. K. V; Mohin, S; Unnikrishnan, K. G (Indian Institute of Astrophysics, 1978)
    A summary of observing conditions at Kavalur Observatory is p0resented. These related to spectroscopic and photometric observations and to seeing as evaluated at the 102cm telescope. Nearly fifty percent of nights on which ...
  • Asymptotic Values of Some Scattering Parameters from Mie Theory 
    Shah, G. A (Indian Institute of Astrophysics, Bangalore, 1991)
    The scattering parameters such as extinction efficiency, albedo, asymmetry parameter, etc, have been studied on the basis of the Mie theory of scattering of electromagnetic radiation by a sphere as well as the classical ...
  • Atlas of H-Alpha Synoptic Charts for Solar Cycle 19 (1955 - 1964): Carrington Solar Rotations 1355 to 1486 
    Makarov, V. I; Sivaraman, K. R (Indian Institute of Astrophysics, Bangalore, 1986)
  • Atmospheric Characteristics at Trombay relating to the October 1995 Solar Eclipse 
    Sapra, B. K; Sunny, Faby; Kulkarni, P. B; Mahadevan, T. N; Pandit, G. G (Indian Institute of Astrophysics, Bangalore, 1997)
    A study was undertaken to examine the effect of a short-term reduction in the solar intensity on the characteristics of the atmospheric environment. Meteorological parameters, solar radiation variations, major pollutant ...
  • Atmospheric Extinction at Kavalur Observatory during 1980-85 
    Shylaja, B. S; Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1986)
    From a series of photoelectric scanner observations during 1980-85, the atmospheric extinction at Kavalur has been analysed. The variation of this appears to follow lamda/sup-4/ law. There is a general increase in the ...
  • Automated Microdensitometer 
    Viswanath, C (Indian Institute of Astrophysics, Bangalore, 1980)
    An interface to a Carl Zeiss microdensitometer and the HCL's micro-computer MICRO 2200 has been built to digitize, log, and process the analog variable density information on photographic plates. The automated process ...
  • An Automated Spectrum Scanner 
    Bappu, M. K. V (Indian Institute of Astrophysics, Bangalore, 1977)
    A rapid-scan single channel spectrum in the Ebert-Fastie arrangement has been constructed and successfully used on the Kavalur 102-cm reflector. The special region 3000-11000 Armstrong is covered with appropriate dry-ice ...
  • Broad Band Photometry of Solar Corona during the Total Solar Eclipse of October 24, 1995 
    Bagare, S. P; Aleem, P. S. M; Singh, J; Saxena, A. K (Indian Institute of Astrophysics, Bangalore, 1997)
    A 30 cm coelostat, a red broad band filter, and a 15 cm objective providing an f/15 beam were used to obtain high resolution picture is recorded with its top around 2Ro, in the near north polar region. The nearest YOHKOH ...
  • Broad Band Photometry of the Solar Corona of 1983, June 11 
    Sivaraman, K. R; Singh, J; Kapoor, R. C; Kariyappa, R (Indian Institute of Astrophysics, Bangalore, 1985-11)
    The solar corona was photographed at an effective wavelength of 6300A during the total eclipse of 1983, June 11 at Indonesia. From the isophotes of the corona, the intensity distributions along the equator, poles, streamers ...
  • Ca II K Emission from the Solar Chromosphere 
    Sivaraman, K. R (Indian Institute of Astrophysics, Bangalore, 1986)
    The role of the Ca II K line as a reliable diagnostic of the chromospheric activity on the Sun is reviewed. The chromospheric structures seen in this line serve as good indicators of the photospheric magnetic structures ...

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