IIA Institutional Repository: Recent submissions

  • Calcium faculae and solar flare effects 
    Bappu, M. K. V; Punetha, L. M (Taylor and Francis, 1962-08)
  • Dynamical properties of quiescent prominence in He D3 5876 Angstrom line emission 
    Prasad, C. D; Ambastha, A; Mathew, S. K (Astronomical Society of India, 1999)
    We have observed a quiescent prominence with the Coude spectrograph of Udaipur Solar Observatory during May 24-25, 1995. Analysis of two dimenstional spectroscopic data was carried out in order to obtain the line shifts ...
  • BVRI CCD photometric standards in the field of GRB 990123 
    Nilakshi; Yadav, R. K. S; Mohan, V; Pandey, A. K; Sagar, R (Astronomical Society of India, 1999)
    The CCD magnitudes in Johnson BV and Cousins RI photometric passbands are determined for 18 stars in the field of GRB 990123. These mesurements can be used in carrying out precise CCD photometry of the optical transient ...
  • Generation of kinetic helicity from irrotational motions 
    Krishan, V; Chitre, S. M (Astronomical Society of India, 1999)
    Vortical and helical fluctuations are an integral part of any turbulent fluid. A turbulent magnetohydrodynamic system with net kinetic helicity is known to support the growth of a large scale magnetic field through the ...
  • Evershed velocities in bipolar sunspots 
    Sundararaman, K; Aleem, P. S. M; Thiagarajan, R (Astronomical Society of India, 1999)
    Spectra taken at the solar telescope-spectrograph, Kodaikanal, are analysed to find the sight-line velocity values in the regions between the opposite polarity sunspots. Velocities in opposite directions in the range 1 - ...
  • A non-anthropic origin for a small cosmological constant 
    Sivaram, C (Astronomical Society of India, 1999)
    An impressive variety of recent observations which include luminosity evolutions of high red shift supernovae strongly suggest that the cosmological constant (/\)is not zero. Even though the /\-term may dominate cosmic ...
  • Some experiments in radiative transfer 
    Abhyankar, K. D (Astronomical Society of India, 1999)
  • Simulation and experimental studies of polarization properties of atmospheric Cerenkov pulses 
    Bhat, C. L; Rannot, R. C; Mohapatra, D. K; Gandhi, V. N; Tickoo, A. K; Kaul, R; Kaul, S. K; Kaul, S. R; Goyal, H. C; Bhatt, N (Astronomical Society of India, 1999)
    We present here preliminary results obtained form some simulation and experimental investigations on the polarization state of atmospheric Cerenkov events.
  • On the accuracy of the caustic test 
    Banerjee, D. P. K; Willstrop, R. V; Anandarao, B. G (Astronomical Society of India, 1999)
  • A two channel high speed photometer for lunar occultation studies in the near - IR 
    Mondal, S; Chandrasekhar, T; Ashok, N. M; Kikani, P. K (Astronomical Society of India, 1999)
    Lunar occultaion in the near infrared has been demonstrated by the PRL group to be an effective method of determining the angular size (in milliarcsecond range)and accurate effective temperature of red giants, supergiants ...
  • Near Infrared polarimeter for extended sources 
    Manian, K. S. B; Shah, V; Thomas, M; Joshi, U. C; Ganesh, S (Astronomical Society of India, 1999)
    A state of art near IR polarimeter was designed and developed at Physical Research Laboratory, Ahmedabad and the polarimeter is operational for the last three years. During the last one year a new mode of operation has ...
  • Night time variation of Fried's parameter at VBT, Kavalur 
    Saha, S. K; Chinnappan, V (Astronomical Society of India, 1999)
    The night time variation of the Fried's parameter, r lower script o is measured on 28-29 March 1991, at the Cassegrain focus of 2.34 m Vainu Bappu Telescope (VBT), at Vainu Bappu Observatory (VBO), Kavalur, India, using ...
  • Ground-based detection of cosmic gamma-ray bursts through atmospheric scintillation technique - A feasibility study 
    Bhat, C. L; Tickoo, A. K; Koul, R; Dhar, V. K; Shanthi, K (Astronomical Society of India, 1999)
    A ground-based experiment is proposed for detecting cosmic gamma-ray bursts. The underlying detection strategy and some salient features of the instrument are discussed in this paper.
  • Computer Network - based data acquisition and control system for the imaging element of the TACTIC array 
    Kanda, A; Koul, R; Bhatt, N; Kaul, S. R (Astronomical Society of India, 1999)
    An interrupt-driven distributed Data AcQuisition and Control System (DAQCS) has been developed for the Imaging Element of the 4-element gamma-ray telescope array, TACTIC. A network of PCs, running the QNX RTOS, have been ...
  • Sensitivity and energy resolution estimates of the TACTIC gamma-ray telescope - Inputs from simulation studies (II) 
    Koul, M. K; Rannot, R. C; Sapru, M. L; Sathyabama, N; Bhat, C. L; Tickoo, A. K; Razdan, A. K; Gandhi, V. N (Astronomical Society of India, 1999)
    The response of the recently-commissioned TACTIC imaging Cerenkov telescope to atmospheric Cerenkov pulses produced by cosmid gamma-ray and hadron-initiated extensive air-showers has been studied through Monte Carlo ...
  • Threshold energy estimates of TACTIC gamma-ray telescope array-Inputs for simulations studies (I) 
    Sathyabama, N; Sapru, M. L; Bhat, C. L; Rannot, R. C; Razdan, A. K; Tickoo, A. K; Koul, M. K; Gandhi, V. N (Astronomical Society of India, 1999)
    Comprehensive simulation studies, using the CORSIKA air-shower code are in progress to predict and optimize the performance of the TACTIC gamma-ray telescope array. Preliminary results are presensted here on the gamma-ray ...
  • Development of a large-area, wide-angle Cerenkov radiation detector for the MYSTIQUE gamma-ray telescope 
    Dhar, V. K; Yadav, K. K; Bhattacharyya, S; Kaul, R. K; Bhat, C. L; Koul, R; Kaul, S. R; Kaul, S. K (Astronomical Society of India, 1999)
    An ultra-sensitive, multi-detector gamma-ray telescope array is being setup at Mt. Abu for cosmic gamma-ray studies in the tens of TeV energy region. Here, we present the essential design features of the Cerenkov radiation ...
  • Drive control system for the TACTIC γ-ray telescope 
    Tickoo, A. K; Koul, R; Kaul, S. K; Kaul, I. K; Bhat, C. L; Bhatt, N (Astronomical Society of India, 1999)
    We present here some salient features of the hardware and software aspects of the 2-axes drive system developed for the TACTIC γ-ray telescope array. A test-report of its performance is also presented
  • Proposed UV - optical payload for the Indian astronomy satellite 
    Pati, A. K (Astronomical Society of India, 1999)
    The Ultraviolet Imaging Telescope is a part of the proposed Indian Multiwavelength Astronomy Satellite mission. The primary objective of the UV Imaging Telescope is an all-sky survey in two bands in the wavelength region ...
  • The Indian multi-wavelength astronomy satellite 
    Rao, A. R (Astronomical Society of India, 1999)
    The Indian X-ray Astronomy Experiment(IXAE) is currently in operation on-board the IRS-P3 satellite launched by the PSLV-D3 rocket in 1996 March 21. Based on IXAE observations, several interesting results have been obtained ...

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