IIA Institutional Repository

Browsing IIAP Publications by Author "Bhattacharyya, J. C"

Browsing IIAP Publications by Author "Bhattacharyya, J. C"

Sort by: Order: Results:

  • HiRES: High-resolution extreme-ultraviolet spectroheliometer toroidal diffraction grating performance evaluation 
    Berger, T. E; Bergamini, P; Walker II, A. B. C; Jain, S. K; Saxena, A. K; Bhattacharyya, J. C; Huber, M. H; Tondello, G; Naletto, G; Baker, P. C (SPIE-The International Society for Optical Engineering, 1993)
    The HiRES sounding rocket payload has been described in detail in previous SPIE Proceedings. Here, optical design of the toroidal grating spectrograph is presented and discussed. Ray tracing results are presented which ...
  • Identification of emission bands in P/Halley 
    Bhattacharyya, J. C; Babu, G. S. D; Ghosh, K. K; Jayakumar, K; Appakutty, M (Indian Academy of Sciences, 1986)
    Spectrophotometric studies of P /Halley (r = 1.98 AU, Δ= 1.19AU, r = 1.97, Δ = 1.16 AU and r = 1.95 AU, Δ. = 1.13 AU) in the spectral range 3900 A - 6450 A were made on three nights and identifications of emission features ...
  • Image processing facilities at Vainu Bappu observatory 
    Giridhar, S; Bhattacharyya, J. C; Kutty, K. N (Tata Institute of Fundamental Research, 1988)
    Need for application of Image processing techniques in astronomical studies in optical wavelengths and special advantages accruing thereby are discussed. The paper describes various image processing facilities that are ...
  • Indian astronomers make solar observations from Antarctica 
    Singh, J; Babu, G. S. D; Bhattacharyya, J. C; Sivaraman, K. R; Uddin, W (Indian Academy of Sciences, 1990-10)
  • Indications of twist in the Epsilon rings of Uranus 
    Vasundhara, R; Bhattacharyya, J. C (Centre national D Etudes Spatiales, 1982)
    The possibility of the Uranus epsilon ring having a structure consisting of a twisted bundle of narrow lanes of condensed material similar to that of Saturn's F ring was examined by cross correlation of a pair of light ...
  • The Intermediate Polar PQ GEM -- Status of Wet Observations of 1996 
    Marar, T. M. K; Seetha, S; Ashoka, B. N; Kasturirangan, K; Mahra, H. S; Bhattacharyya, J. C; Leibowitz, E. M; Hemar, S; Mendelson, H; Ibbetson, P. A; O'Donoghue, D; Buckley, D. A. H; Breger, M; Handler, G; Sperl, M; Serkowitsch, E; Moskalik, P; Zola, S; Pajdosz, G; Krzesinski, J; Silvotti, R; Vauclair, G; Dolez, N; Solheim, J. E; Pfeiffer, B; Kepler, S. O; Kanaan, A; Provencal, J; Kawaler, S. D; O'Brien, M. S; Nather, R. E; Winget, D. E; Kleinman, S; Nitta, A; Bradley, P. A; Guzik, J. A; Clemens, C; Sullivan, D. J; Jiang, X (Baltic Astronomy, 1998-03)
    A summary of the results on PQ Gem based on WET observations conducted in February 1996 is presented. The 13.9 min spin period of the white dwarf in the system and the orbital side-band at 14.5 min have been detected ...
  • Ionospheric electron content and equivalent slab thickness in the equatorial region 
    Das Gupta, A; Basu, S; Bhar, J. N; Bhattacharyya, J. C (American Geophysical Union, 1975-02)
    The ionospheric total electron content and equivalent slab thickness in the equatorial region around 75° E have been studied. It is found that the slab thickness exhibits a strong latitudinal dependence with a maximum at ...
  • Ionospheric Indication of Short-time Solar Activity Variations 
    Bhattacharyya, J. C; Sunder, R. S (PID [Publications and Information Directorate], 1970)
    A series of Lyot filtergrams have been photometrically analysed and the variations in the plage intensity determined on a number of days. From simultaneous ionosonde records, correlation has been sought between the electron ...
  • King Comet 
    Datta, B; Bhattacharyya, J. C (Nehru Centre, 1985-09)
  • Lunar occultation techniques in investigations of binary stars 
    Bhattacharyya, J. C (Tira Pustaka, Jakarta, 1984)
    The paper discusses the possibility of direct measurement of angular separations and luminosity ratios of components of unresolved binary systems through observations of lunar occultations. A current program at Kavalur ...
  • Measurement of Solar Magnetic Fields 
    Bhattacharyya, J. C; Balasubramaniam, K. S (Indian Institute of Astrophysics, Bangalore, 1986)
    The paper reviews several methods of estimation of solar magnetic fields so far employed. The possibility of measurement of the vector magnetic fields by using two dimensional detector arrays is discussed. A program for ...
  • Measurement of vector magnetic fields. I - Theoretical approach to the instrumental polarisation of the Kodaikanal Solar Tower 
    Balasubramaniam, K. S; Venkatakrishnan, P; Bhattacharyya, J. C (D. Reidel Publishing Co., 1985-09)
    The observations of Stokes line profiles require an accurate knowledge of the instrumental polarisation caused by optical components in the path of the light beam. In this context we present a theoretical approach to the ...
  • Minor planets and planetary rings 
    Bhattacharyya, J. C (Centre of Advanced Study in Astronomy Osmania University, 1984)
    Circumstances of the discovery of the first asteroid and the characteristics of various orbits followed by them have been discussed. Their shapes, compositions and evolutionary histories so far known have also been described. ...
  • New Instrumentation efforts in Solar studies 
    Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1988)
  • A new satellite of Uranus 
    Bhattacharyya, J. C; Kuppuswamy, K (Nature Publishing Group, 1977-05)
    During the observation of the occultation of the star SAO 158687 by Uranus on March 10, 1977, there occurred an unexpected event which suggests the existence of a hitherto unknown satellite of the planet. On the basis of ...
  • New telescopes in India 
    Bhattacharyya, J. C (D. Reidel Publishing Co., 1986-01)
    The review covers the description and present status of the two optical/infrared telescopes designed and presently near fabrication in India. The 234 cm aperture optical telescope expected to be installed at Kavalur shortly ...
  • Obituary - Bappu, M. K 
    Bhattacharyya, J. C (Royal Astronomical Society, 1983-03)
  • Observations of comet Shoemaker-Levy 9 from Japal-Rangapur Observatory 
    Vasundhara, R; Chakraborty, P; Rajamohan, R; Bhattacharyya, J. C; Som Sunder, G; Vivekananda Rao, P; Swaminathan, R; Lokanandham, B (Indian Academy of Sciences, 1995-02)
  • Observations of Optical Emission from X-Per and SCO X-1 
    Sharma, P. D; Nagaraja, V. B; Marar, K. T. M; Bhattacharyya, J. C; Mohin, S (IUPAP, 1981)
    High speed photometric observations of X-per, and SCO X-1 have been carried out during 1979-80 with the 102cm and 33cm telescope at the Kavalur observatory. Results from some of these observations are presented in this ...
  • Observations of X-Per in optical domain 
    Sharma, D. P; Nagaraja, B. V; Bhattacharyya, J. C; Mohin, S; Raveendran, A. V (Kluwer Academic Publishers, 1983-09)
    We have monitored the X-ray source X-Per (4U 0352+30) on 31 August, 1979 through aU filter for about 1.5 hr using 102-cm telescope of Kavalur observatory. During this period intensity of X-Per fluctuated for some time, on ...

Search DSpace


Browse

My Account