Publications of Astronomical Society of India: Recent submissions

  • Photometric Flash-Light Observations of SL9 Impact on Jupiter 
    Srivastava, R. K; Padalia, T. D; Mahra, H. S (Astronomical Society of India, 1997)
    The effect of SL9 impact on Jupiter has been assessed by observing flash-light effect on the nearest satellite of Jupiter, the Io, on 21 July, 1994. The observations in V filter of flash-light effect on Io suggest a ...
  • Me, an astronomer? 
    Vaidya, P. C (Astronomical Society of India, 1997)
  • High Energy Gamma-Ray Pulsars 
    Ramanamurthy, P. V (Astronomical Society of India, 1997)
    To date we know the existence of six high energy gamma-ray (HEGR) pulsars and a possible seventh candidate, besides a solitary low energy gamma-ray pulsar. In this paper, we briefly summarize the observations on the seven ...
  • Cosmic Rays, X-Ray Astronomy and Be Stars: A Career of Research in Astronomy 
    Apparao, K. M. V (Astronomical Society of India, 1997)
    The autobiographical article presents discussions in the topics of particle physics and cosmic rays, He-3 isotopes, crab nebula, antiprotons, neutron stars, cyclotron lines, infrared bursts, gamma ray bursts, white holes ...
  • On the disappearance of H-alpha filaments and soft X-ray enhancements as seen from Yohkoh SXT 
    Singh, J; Sakurai, T; Ichimoto, K (Astronomical Society of India, 2001)
    We have studied H-alpha images of the sun taken at Kodaikanal and Mitaka observatories and soft X-ray images obtained by SXT onboard Yohkoh for the years 1993 and 94. From events of disappearing quiescent H-alpha filaments ...
  • Joys and frustration - A scientist's diary 
    Alurkar, S. K (Astronomical Society of India, 1997)
  • Steady part of rotation and toroidal component of magnetic field in the solar convective envelope 
    Hiremath, K. M (Astronomical Society of India, 2001)
    With reasonable assumptions and approximations, we solve analytically the full set of Chandrasekhar's (1956) MHD equations in the convective envelope, for steady part of rotation and toroidal component of the magnetic field ...
  • My life as an astronomer 
    Alladin, S. M (Astronomical Society of India, 1997)
    Factors which motivated me to pursue Astronomy are discussed. Dynamics of galaxies has been the principal area of my research. Work done by me and my associates in this field is indicated. Our work on frequency of occurrence ...
  • Optical photometry of the GRB 010222 afterglow 
    Cowsik, R; Prabhu, T. P; Anupama, G. C; Bhatt, B. C; Sahu, D. K; Ambika, S; Padmakar; Bhargavi, S. G (Astronomical Society of India, 2001)
    The optical afterglow of GRB 010222 was observed using the recently installed 2-m telescope at the Indian Astronomical Observatory, Hanle, and the telescopes at the Vainu Bappu Observatory, Kavalur, beginning ~ 0.6 day ...
  • Critical mass value and secular solutions of the generalised photogravitational Robe's restricted three-body problem 
    Ghosh, R. N; Moshra, B. N (Astronomical Society of India, 2001)
    The secular solutions of Robe's restricted three-body problem is dealt in this paper when the first primary is an oblate spheroid-rigid shell, filled with homogeneous, incompressible fluid, with its equatorial plane ...
  • A modular cryostat for large format and mosaic CCDs 
    Nagaraja Naidu, B; Srinivasan, R; Sagay Nathan, K (Astronomical Society of India, 2001)
    With a growing requirement for wide field imaging, the era of mosaic CCDs is gaining importance in astronomical imaging. Large volume cryostats are needed to house large format and mosaic CCDs. A modular CCD cryostat has ...
  • Study of the solar wind streams associated with intense geomagnetic storms 
    Dubey, S. C; Mishra, A. P (Astronomical Society of India, 2001)
    A set of 50 intense geomagnetic storms follows the criteria of Dst≤-100 nT, IMF B ≥10 nT with time duration ≥ 3 hr., during the solar maximum period (1989-91) of solar cycle 22 have been analysed. The study of this short ...
  • Non-linear oscillation of inter-connected satellites system under the combined influence of the solar radiation pressure and dissipative force of general nature 
    Sharma, S; Narayan, A (Astronomical Society of India, 2001)
    The non-linear oscillation of inter-connected satellites system about its equilibrium position in the neighabourhood of main resonance ω = 1, under the combined effects of the solar radiation pressure and the dissipative ...
  • Flat Spectrum Gamma Ray Burst Afterglows 
    Bhattacharya, D (Astronomical Society of India, 2001)
    Temporal behaviour of GRB afterglow light curve is derived for the case where the electron energy distribution is relatively hard, with the power-law index p lying between 1.0 and 2.0. It is shown that the expected behaviour ...
  • Optical and radio observations of the bright GRB 010222 afterglow: evidence for rapid synchrotron cooling ? 
    Sagar, R; Stalin, C. S; Bhattacharya, D; Pandey, S. B; Mohan, V; Castro-Tirado, A. J; Pramesh Rao, A; Trushkin, S. A; Nizhelskij, N. A; Bremer, M; Castro Ceron, J. M (Astronomical Society of India, 2001)
    We report photometric observations of the optical afterglow of GRB 010222 in V, R and I passbands carried out between 22-27 February 2001 at Nainital. We determine the CCD Johnson BV and Cousins RI photometric magnitudes ...
  • Spot and filament rotation in a sigmoidal flare 
    Sundararaman, K; Ramesh, K. B; Selvendran, R (Astronomical Society of India, 2001)
    The role played by the rotation of the umbrae in a sunspot with respect to the H? filament in inducing magnetic shear for the sigmoidal brightening is reported in this paper. We carried out these studies by using photoheliogram ...
  • Franck-Condon factors and r-centroids for the B, C, D - X and d-b band systems of astrophysical molecule BF 
    Raja, V; Rajamanickam, N (Astronomical Society of India, 2001)
    The Franck-Condon factors and r-centroids, which are very closely related to transition probabilities, have been evaluated by the reliable numerical integration procedure for the bands of B1?+ - X1?+, C1?+ - X1?+ D1?-X1?+ ...
  • A study of the old galactic star cluster Berkeley 32 
    Richtler, T; Sagar, R (Astronomical Society of India, 2001)
    We present new CCD photometry of the distant old open star cluster Berkeley 32 in Johnson V and Cousins I passbands. A total of ~ 3200 stars have been observed in a field of about 13? x 13?. The colour-magnitude diagram ...
  • Seeing and microthermal measurements near Devasthal top 
    Stalin, C. S; Sagar, R; Pant, P; Mohan, V; Kumar, B; Joshi, Y. C; Yadav, R. K. S; Joshi, S; Chandra, R; Durgapal, A. K; Uddin, W (Astronomical Society of India, 2001)
    Results of the seeing measurements carried out near Devasthal top on 43 nights during March to April 1999 are presented. Open air seeing measurements were carried out with a differential image motion monitor (DIMM) using ...
  • Observation of second cyclotron line feature in the spectrum of Her X-1 
    Manchanda, R. K (Astronomical Society of India, 2001)
    Hard X-ray spectrum of Her X-1 was measured during a balloon flight experiment launched on March 30, 1997 using a large area scintillation counter telescope. The instrument code named LASE, operates in the 20-200 keV energy ...

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