Publications of Astronomical Society of India: Recent submissions

  • Dynamics of Limb Flare and Associated Primary and Secondary Post Flare Loops 
    Uddin, W; Joshi, B; Chandra, R; Joshi, A (Astronomical Society of India, 2003)
    In this paper we present the analysis of M 1.8 class (GOES SXR) limb flare and associated post flare loops of 2 May, 2001 which erupted on the west limb in NOAA 9433 (N15, W88). The flare started at around 00:32 UT from a ...
  • On the Rapid Variations of Solar Magnetic Fields 
    Venkatakrishnan, P; Kumar, B; Ravindra, B (Astronomical Society of India, 2003)
    We report on the rapid variations of solar magnetic fields that appear to be enhanced significantly above the background variability, at a few locations within the solar active regions, as observed with the Michelson Doppler ...
  • Quiet Sun Chromospheric Network Magnetic Field 
    Ravindra, B (Astronomical Society of India, 2003)
    The 3-D structure of quiet Sun chromospheric network magnetic field is studied by comparing the observed and computed chromospheric magnetograms. The comparison shows that the best correlation occurs at 1800 km above the ...
  • White Light and Emission Line Polarization of Solar Corona during TSE of June 21, 2001 
    Ambastha, A; Gosain, S (Astronomical Society of India, 2003)
    Coronal intensity and polarization maps have been obtained for the total solar eclipse (TSE) o o of June 21, 2001, observed from Lusaka, Zambia (location: 28 17.5E 15 24.5S, Alt. 1300 mtr) at broadband H 6563Å (FWHM 80Å), ...
  • Study of Three Homologous Solar Flares Observed from Active Region NOAA 9033 on 12th June 2000 
    Verma, V. K; Vats, H. O (Astronomical Society of India, 2003)
    In the paper, we present a study of three homologous H flares observed on 12th June 2000 in active region (AR) NOAA 9033. During the observation of AR NOAA 9033 on 12th June 2000, we observed 1st solar flare between 0135-0155 ...
  • Physics of Structure Formation in the Universe 
    Choudhury, T. R (Astronomical Society of India, 2003)
    In recent years, unprecedented progress in observational cosmology has revealed a great deal of information about the formation and evolution of structures in the universe. This, in turn, has raised many challenging issues ...
  • Study of Radio and Optical Polarization Anisotropies in the Electromagnetic Waves from Extragalactic Sources 
    Sarala, S (Astronomical Society of India, 2003)
    Polarizations of electromagnetic radiation from active galactic nuclei (AGN) show some interesting effects such as the existence of a global anisotropy in the orientations of the radio wave polarizations from distant radio ...
  • A Comparative Study of Intra-night Optical Micro-variability of High Luminosity AGN Classes 
    Stalin, C. S (Astronomical Society of India, 2003)
    This thesis explores mainly the problem of the radio loudness dichotomy in quasars. This is addressed by carrying out an extensive search for intra-night optical variability (INOV) in seven sets of optically luminous ...
  • Studies of Young Stellar Objects 
    Yadav, R. K. S (Astronomical Society of India, 2003)
    We present a detailed study of four young open star clusters and two OB associations using deep CCD U B V R I and 2MASS J H Ks measurements. Physical parameters of the clusters have been estimated using optical as well as ...
  • Ultra Violet Imaging Telescope (UVIT) Science* 
    Kameswara Rao, N (Astronomical Society of India, 2003)
    Some of the significant areas of astronomy that would be persued by UVIT, one of the payloads on the proposed Indian multiwavelength astronomy satellite ASTROSAT, is described. Some of the considerations and uniqueness of ...
  • TAUVEX - An Ultraviolet Imager on the Indian GSAT-4 Satellite 
    Murthy, J (Astronomical Society of India, 2003)
    The TAUVEX instrument consists of three imagers operating in several bands in the mid to near UV. We have proposed to fly TAUVEX as a secondary payload on the GSAT-4 mission to be launched in late 2004 and this proposal ...
  • Application of neural network for the gamma-hadron discrimination 
    Maneva, G. M; Temnikov, P. P (Astronomical Society of India, 2002)
    Artificial Neural Network (ANN) method is applied for the analysis of raw data from the gamma ray CELESTE experiment. Our preliminary results show that, in the energy range 30-300 GeV, a good discrimination between showers ...
  • Multi-band monitoring and polarimetry of GRB afterglows with the IUCAA telescope 
    Ramaprakash, A. N (Astronomical Society of India, 2002)
    The IUCAA 2m telescope which is scheduled to be available for observations in early 2002, will initially have two instruments at its f/10 Cassegrain focii - the IUCAA FAint Object Spectrograph Camera (IFOSC) and the ...
  • Observations of GRB afterglows from Nainital : Evidence in favour of jet model 
    Sagar, R (Astronomical Society of India, 2002)
    Broad band optical photometric observations of five Gamma-ray burst (GRB) afterglows (GRB 990123, GRB 991208, GRB 991216, GRB 000301c and GRB 000926) are taken from Nainital during 1999 and 2000. These in combination with ...
  • MACE telescope : Servo design aspects 
    Mayya, Y. S; Srivatsava, G. P; Koul, R (Astronomical Society of India, 2002)
    The design parameters of the servo system for the MACE imaging Cerenkov telescope, based on functional performance, operational and safety requirements of the system are briefly discussed. the servo system is designed ...
  • Salient mechanical design features of the proposed 17 meter diameter MACE imaging gamma-ray telescope 
    Suthar, R. L; Guha, S; Bandopadhyay, K; Mishra, V. K; Koul, R; Bhat, C. L (Astronomical Society of India, 2002)
    A low-threshold energy, high-sensitivity gamma-ray telescope, MACE (for Major Atmospheric Cerenkov Experiment) is proposed to be built in India for explorations of gamma-ray sky in 100's keV - 10's GeV photon energy range, ...
  • Signal processing instrumentation of gamma-ray telescopes of the GRACE project 
    Mukhopadhyay, P. K (Astronomical Society of India, 2002)
    The TACTIC Cerenkov telescope has recently been commissioned at Mount Abu, Rajasthan. The signal processing electrinics of the 349 element imaging camera was a totally indigenous development. A number of groups from ...
  • VHE gamma-ray astronomy experiments in India - Imaging cerenkov technique 
    Bhat, C. L; Kaul, R. K (Astronomical Society of India, 2002)
    The recent advances in the field of very high energy (VHE) or TeV gamma-ray astronomy, culminating in the unambiguous detection of several galactic and extragalactic sources, owes itself largely to the successful exploitation ...
  • Electrodynamic structure of an outer-gap accelerator : Gamma-ray emission from the crab pulsar 
    Hirotani, K; Shibata, S (Astronomical Society of India, 2002)
    We investigate a stationary pair production cascade in the outer magnetosphere of a spinning neutron star. The charge depletion due to a global current, causes a large electric field along the magnetic field lines. Migratory ...
  • Non-imaging Gamma Ray Telescopes 
    Smith, D. A (Astronomical Society of India, 2002)
    Despite continual improvement of the Atmospheric Cherenkov Technique, the number of astrophysical gamma ray sources that have been well studied from the ground remains small (less than a half-dozen), due mainly to the ...

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