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Browsing Indian Institute of Astrophysics by Title

Browsing Indian Institute of Astrophysics by Title

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  • Saturn-like ring system around Uranus 
    Bhattacharyya, J. C; Bappu, M. K. V (Nature Publishing Group, 1977-12)
    A photoelectric record of the occultation of SAO 158687 by Uranus on March 10, 1977, is analyzed. The observed variation in the intensity of the star's light is shown to indicate the presence of four zones, which are ...
  • Search for optical bursts from the gamma ray burst source GBS 0526-66 
    Seetha, S; Sreenivasaiah, K. V; Marar, T. M. K; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (NASA/STI, 1985-08)
    Attempts were made to detect optical bursts from the gamma-ray burst source GBS 0526-66 during Dec. 31, 1984 to Jan. 2, 1985 and Feb. 23 to Feb. 24, 1985, using the one meter reflector of the Kavalur Observatory. Jan. 1, ...
  • 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 ...
  • 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
  • A Single-Channel Polarimeter 
    Jain, S. K; Bhattacharyya, J. C (International Astronomical Union, 1986)
    The authors have developed a single-channel photopolarimeter to measure polarization to ≡1%, with an accuracy of 0.1%. Laboratory tests show that the performance of the instrument matches the requirements.
  • Site survey for an infrared observatory 
    Bhatnagar, A (Centre of Advanced Study in Astronomy, Osmania University, Hyderabad, 1974)
  • Size of the Ca+ Coarse Network in the Solar Chromosphere at Sunspot Minimum 
    Bappu, M. K. V; Sivaraman, K. R (1966)
    Auto-correlation measures of the coarse Ca+ network made on selected spectroheliograms obtained during the solar minimum period of 1964 and 1965 are described. The full width at half maximum of the normalised A.C. curve ...
  • The Solar Corona of July 20, 1963 
    Bappu, M. K. V; Bhatnagar, A (Kodaikanal Observatory, 1969-01)
    The total solar eclipse of July 20, 1963 was observed at the AAVSO site near Wilton, Malne, U.S.A, where totality lasted for 58 seconds. Pictures of the corona were obtained with a camera of focal length 57 cm on Kodak ...
  • Solar eclipses - A powerful tool for the study of nature 
    Bhattacharyya, J. C (National Institute of Science Communication and Information Resources, 1990-12)
    Solar eclipses occur due to periodic coincidences in positions of the moon and the earth with respect to the sun. Characteristics of their orbital paths determine the periodicity, duration and shape, lengths and orientations ...
  • Solar eclipses during 1868-1980 in which Madras, Kodaikanal Observatories and IIA participated 
    Birdie, C; Vagiswari, A (Indian Institute of Astrophysics, 2009-06)
    Participation in solar eclipse studies have been a notable characteristics of the institute for more than a century. For all major eclipses teams were sent and the expedition met with a considerable degree of success. ...
  • The Solar Magnetometer of Kodaikanal Observatory 
    Bhattacharyya, J. C (Kodaikanal Observatory, 1970-10)
    An instrument capable of measurement of weak longitudinal component of magnetic fields on the sun has been designed and constructed for operation with the horizontal solar telescope and high dispersion spectrograph of ...
  • Solar physics at Kodaikanal 
    Bappu, M. K. V (D. Reidel Publishing, 1967-01)
  • Solar physics in India 
    Krishan, V; Bhattacharyya, J. C (National Solar Observatory, 1988-07)
  • Some characteristics of the solar wind inferred from the study of sodium emission from cometary nuclei 
    Bappu, M. K. V; Sivaraman, K. R (D. Reidel Publishing, 1969-12)
  • Some further characteristics of observing conditions at Leh 
    Singh, J; Bhattacharyya, J. C; Babu, G. S. D; Appakutty, M; Kuppuswamy, K; Moorthy, V; Devendran, P; Velu, C; Sivakumar, R (Astronomical Society of India, 1990-03)
    The sky conditions were monitored and duration of photometric and spectroscopic hours determined on 198 nights during the period September 1984 to October 1986. Observations were continued from May till November 1987 and ...
  • Some further characteristics of observing conditions at Leh 
    Singh, J; Bhattacharyya, J. C; Babu, G. S. D; Appakutty, M; Kuppuswamy, K; Moorthy, V; Devendran, P; Velu, C; Sivakumar, R (Astronomical Society of India, 1990-03)
    The sky conditions were monitored and duration of photometric and spectroscopic hours determined on 198 nights during the period September 1984 to October 1986. Observations were continued from May till November 1987 and ...
  • Some further measurements of Uranian ring condensations 
    Vasundhara, R; Bhattacharyya, J. C; Rajamohan, R; Mahra, H. S (Kluwer Academic Publishers, 1983)
    The results of photometric observations of the occultation of BD-19 degree 4222 by Uranus on April 26, 1981 from two stations in India conform with the model proposed by Elliot et al. (1981).
  • The spectra of Wolf-Rayet stars at high dispersion 
    Bappu, M. K. V (D. Reidel Publishing, 1973)
  • Spectral characteristics of a solar flare from ionospheric data 
    Bhattacharyya, J. C; Balakrishnan, T. K (Pergamon Press Ltd, 1967)
    From the height variation of electron densities during a solar flare, ultra violet and X-ray contribution of ionization process has been estimated. The results thus obtained are in conformity with direct measurements of ...
  • Spectroscopic study of amethyst quartz in the ultraviolet and infrared regions 
    Bappu, M. K. V (Indian Association for the Cultivation of Science, 1953)
    In this paper a study is made of the absorption of light in the ultravia!rt end infrared regions in amethyst quartz. In the ultraviolet the presence of the V-band is masked by the presence of iron impurity and it is ...

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