Publications of Astronomical Society of India: Recent submissions

  • Short-term periodicities in the north-south asymmetry of the Sun's surface rotation 
    Javaraiah, J (Astronomical Society of India, 2002-09)
    Power spectra of N-S asymmetries of the coefficients A and (j of the Sun's surface differential rotation determined from the Mt. Wilson velocity data during 1982-1994 suggest the existence of a period at 374 ± 30 day in ...
  • Three Dimensional Structure of Active Regions 
    Choudhary, D. P; Gosain, S (Astronomical Society of India, 2002-09)
    We present the preliminary results of the modeling of the three dimensional structure of the magnetic field above the aclive regions observed with Advanced Stokes polarimeter and Dick Dunn telescope at National ...
  • Magnetic and velocity fields over active regions 
    Gosain, S; Choudhary, D. B (Astronomical Society of India, 2002-09)
    In order to understand the nature of dynamics over an active region (AR) , it is necessary to study the velocity and magnetic fields simultaneously. We present the preliminary results from our analysis of spectropolari ...
  • Temporal variations of solar p-mode frequencies on time scales of 27 days 
    Tripathy, S. C; Jain, K; Bhatnagar, A (Astronomical Society of India, 2002-09)
    We have studied variations in the frequencies of intermediate degree solar oscillation modes on a time cadence of 18 and 27 days. We report that the p-modes adjust to changes in the activity measures on time scales as ...
  • Interfacial hydromagnetic waves with shear and inclined magnetic fields 
    Satya Narayanan, A; Ramesh, R (Astronomical Society of India, 2002-09)
    The combined effect of non-parallel propagation, steady :flow and inclined magnetic field on the . propagation characteristics of hydromagnetic surface waves is examined. The fluid is assumed to be perfectly conducting ...
  • How Thick are the Saturn's Rings? 
    Chakrabarti, S. K; Bhattacharyya, A (Astronomical Society of India, 2002-09)
    It has been long thought that the rings of saturn are probably not thicker than a few hundreds of meters. By actually following the motion of particles inside the decaying bending waves of the Saturn's rings and matching the ...
  • Can geoeffectiveness of CMEs be predicted? 
    Srivastava, N (Astronomical Society of India, 2002-09)
    Coronal mass ejections or CMEs are well known as the drivers of enhanced interplanetary and geomagnetic activity. They are large expulsions of material from the Sun, which travel into the interplanetary (IP) medium. ...
  • Probing the Sun's hot atmosphere: Views from Yohkoh, SOHO and TRACE 
    Dwivedi, B. N (Astronomical Society of India, 2002-09)
    This article reviews some recent progress in our understanding of the Sun's hot atmosphere. using data from spacecraft (Yohkoh, SOHO and TRACE) and from ground-based eclipse experiments.
  • The maximum mass of neutron stars 
    Srinivasan, G (Astronomical Society of India, 2002-09)
    The choice of a suitable topic for this talk posed a problem for me. Should I talk about some work I have done recently? Or, should I talk about something which is not yet resolved, but of great contemporary Significance? ...
  • Gamma Ray Burst Data Analysis: Algorithms and Procedure 
    Sinha, S (Astronomical Society of India, 2003)
    In Gamma Ray Burst experiments it is very important to obtain realistic and accurate estimates of the Burst parameters, viz. the event trigger time, the duration, peak hardness ratio, peak fluxes and fluences in different ...
  • Multi-fractal and Wavelet Analysis for Cosmic Ray Multi-fractal and Wavelet Analysis for Cosmic Ray Mass Composition Studies using the TACTIC Telescope 
    Bhat, C. K; Kaul, R. K (Astronomical Society of India, 2003)
    We have investigated the efficiency of multifractal and wavelet parameters of the simulated images of atmospheric Cerenkov events, in segregating the events in terms of primary mass. We find that the fractal dimension D6 ...
  • Simulation Studies for Optimizing the Trigger Field of View of the TACTIC Imaging Element 
    Koul, M. K; Sapru, M. L (Astronomical Society of India, 2003)
    Simulation studies, for the Imaging Camera of the TACTIC -ray telescope have been carried out to optimize its trigger field of view for a point -ray source. The results indicate that a trigger field of 9 x 9 pixels should ...
  • Artificial Neural Network-based Image-cleaning Method for Atmospheric Cerenkov Imaging Telescopes 
    Dhar, V. K; Tickoo, A. K; Kaul, M. K; Kaul, C. L; Rannot, R. C; Yadav, K. K; Dubey, B. P; Koul, R (Astronomical Society of India, 2003)
    A novel image-cleaning method, based on the utilization of Artificial Neural Network (ANN) is shown here to `correctly' select more pixels in a Cerenkov image than in the conventional approach.
  • A High Energy Photon Detector Simulation System 
    Sinha, S (Astronomical Society of India, 2003)
    A high energy photon detector simulation software based on detailed Monte Carlo method starting from first principles is under development. The current status of this endeavour and some of the results obtained recently ...
  • Image Reconstruction for a Continuously Rotating Coded Mask Camera 
    Shankar, B. T. R; Bhattacharya, D (Astronomical Society of India, 2003)
    We discuss a method for reconstructing the image for Scanning Sky Monitor which is a continuously rotating X-ray coded mask camera aboard the Indian astronomical satellite, ASTROSAT.
  • A Dynamic Sky Simulation for the Scanning Sky Monitor on ASTROSAT 
    Mishra, S. D; Bhattacharya, D (Astronomical Society of India, 2003)
    We have developed a dynamic sky simulation software for the visualization of the operation of the Scanning Sky Monitor cameras. This software can be used for the background modelling of the cameras and the refinement of ...
  • Scanning Sky Monitor (SSM) on ASTROSAT- A Status Report 
    Seetha, S; The SSM team of ASTROSAT (Astronomical Society of India, 2003)
  • Control and Operation of SOXS High Energy Detector 
    Janawlekar, S. B; Malkar, J. P; Rao, A. R; Vadawale, S. V; Vahia, M. N; Umapathy, C. N (2003)
    The control and operation of the SOXS High Energy Detector (HED) experiment is done using a micro-processor based data handling system (the GSAT-2 SOXS High Energy Electronics package - GXHE). The GXHE system is used for ...
  • The Ultra Violet Imaging Telescope: Mechanical Design 
    Pati, A. K; Mahesh, P. K; Nagabhushana, S; Subramanian, V. K (Astronomical Society of India, 2003)
    The Ultra Violet Imaging Telescope (UVIT) is one of the major scientific instruments on the proposed ASTROSAT mission of the Indian Space Research Organisation. The design of a telescope to meet the scientific requirements ...
  • High Resolution Spectroscopy with Submillimeter-Wave 
    Kumar, V; Dave, H (Astronomical Society of India, 2003)
    In order to explain the characteristic features of planetary atmosphere, detection and precise measurements of environmentally important gases such as CO, CIO, No becomes necessary. Since most of the polyatomic molecules ...

Search DSpace


Browse

My Account