IIA Institutional Repository: Recent submissions

  • Sudden phase anomalies during solar flares 
    Pant, P (Astronomical Society of India, 1994)
    The solar flares during 1977 September have been analyzed in the light of their sudden phase anomalies (SPA) signals over long propagation paths. The analyzed data show an apparent linear relation between log (sec chi) and ...
  • Magnetohydrostatic equilibrium in solar coronal arcades 
    Chandra, S; Prasad, L (Astronomical Society of India, 1994)
    We present a solution of magnetohydrostatic equations after including the effect of gravity. For low values of the parameters beta, there exist two solutions for the common boundary condition at the base of the corona. ...
  • On the detectibility of HeH(+) in the solar photospheric spectrum 
    Sinha, K (Astronomical Society of India, 1994)
    In a recent publication of the Bulletin of the Astronomical Society of India, the possibility of detection of the (1-0) vibration-rotation lines of HeH(+) molecules in the solar photospheric spectrum has been suggested. ...
  • Atmospheric extinction and background light measurements at Jammora, Jammu 
    Kaul, S. R; Dhar, V. K; Kaul, M. K; Bhat, R. K; Sapru, M. L; Kaul, R. K; Bhat, C. L (Astronomical Society of India, 1994)
    Atmospheric extinction and background light measurements have been carried out at Jammora for the period 1991 October-November, with a view to evaluate its suitability as a site for our new ground-based gamma-ray observatory. ...
  • On heating of stellar (solar) chromospheres and coronae by magnetoacoustic waves: A review 
    Narain, U; Agarwal, P (Astronomical Society of India, 1994)
    Stellar chromospheres and coronae may be heated by waves of various types. Magnetoacoustic waves are one of them. Subphotospheric turbulence generates various types of waves. Here the basic theory of generation, propagation ...
  • A centenary tribute to Meghnad Saha 
    Kamal, A. A (Astronomical Society of India, 1994)
  • On the unusual surge of 1991 November 16 
    Bondal, K. R; Gaur, V. P; Joshi, A; Uddin, W; Pande, M. C (Astronomical Society of India, 1994)
    An unusually 'long' surge of 'short' duration occurred in the NW region of the sun's limb on 1991 November 16, around 04 15 UT. Time-lapse photographic observations employing a Halle H-alpha filter having a 0.5/0.7 A ...
  • Non-linear planar oscillation of a satellite in elliptical orbit under the influence of solar radiation pressure, 1 
    Bhatnagar, K. B; Khan, A; Saha, L. M (Astronomical Society of India, 1994)
    The non-linear oscillations of a satellite in an elliptic orbit around the earth under the influence of the solar radiation pressure have been studied in a series of papers 1 and 2. In paper 1, by using Melnikov's method ...
  • The infrared fluxes of early type stars 
    Shylaja, B. S (Astronomical Society of India, 1994)
    It is well known that the strong winds of the early type stars modify the fluxes in the infrared and radio wavelength regions. This aspect has been used here to explain the infrared fluxes by the method of 'curve of growth'. ...
  • External perturbations and rate of cometary capture 
    Sharma, S. D; Khanna, M (Astronomical Society of India, 1994)
    Capture of comets by Sun is attributed to some disturbing force field (Hills 1981; Yabushita 1971, 1972, 1979; Biermann et al. 1983 etc.). In the present exposition an attempt has been made to study the mechanism of the ...
  • General motion of N-rigid bodies 
    Bhatnagar, K. B; Saha, L. M (Astronomical Society of India, 1994)
    This is a review article on the general motion of N-rigid bodies. The development of analytical qualitative methods in the study of the rigid-body motion are presented in a systematic way starting from early researches of ...
  • Helioseismic detections of overshoot below the solar convection zone 
    Basu, S; Antia, H. M; Narasimha, D (Astronomical Society of India, 1993)
    It is generally accepted that there is no adequate theory to describe astrophysical convection. In particular, there is no agreement among different theories about the extent of overshoot from stellar convection zones. The ...
  • Critique of Fischer-Tropsch type reactions in the solar nebula 
    Ramadurai, S; Hoyle, F; Wickramasinghe, N. C (Astronomical Society of India, 1993)
    The paucity of kinetic data for the operation of Fischer-Tropsch Type (FTT) reactions, at the appropriate conditions for the primitive solar nebula, is highlighted. The observed isotopic abundances of D, C-13 and N-15 in ...
  • What is a quiet sun CaII K line profile? 
    Sivaraman, K. R; Gupta, S. S; Kariyappa, R (Astronomical Society of India, 1993)
    We have derived a mean disc averaged K line profile from observations at the Kodaikanal Solar Tower Telescope on days when sun was relatively very quiet during the years 1985-86. This mean profile would represent the K-line ...
  • Solar variability in the CaII K during solar cycles 21 and 22 
    Sivaraman, K. R; Gupta, S. S; Kariyappa, R; Aleem, P. S. M; Sundararaman, K (Astronomical Society of India, 1993)
    We have monitored the sun in the light of the CaII K line and obtained the disc integrated profiles for the years 1974-91. From these profiles we have estimated the variability of the sun as a star as seen in the various ...
  • Imaging polarimetry of comet Austin 
    Joshi, U. C; Chauhan, J. S; Deshpande, M. R; Sen, A. K; Bhatnagar, A. K (Astronomical Society of India, 1993)
    Comet Austin (1989c) was observed during April and May 1990 when its phase was between 106 deg and 110 deg. No unusual activity in the form of jet is seen in the polarization map. Polarization is low near the nucleus and ...
  • UBV photometry of comet Swift-Tuttle (1992t) 
    Padalia, T. D; Gupta, S. K; Srivastava, R. K; Chaubey, U. S (Astronomical Society of India, 1993)
    The comet Swift-Tuttle (1992t) was observed through UBV filters during twelve nights in December 1992. Magnitude variations of six circular zones from the center of the cometary head have been given. On the night of 17 ...
  • Radio observations of quadrantid meteor shower 
    Yellaiah, G; Lodanadham, B (Astronomical Society of India, 1993)
    The radio observations of quadrantid meteor shower obtained during the period 1983-88 have been analyzed. Diurnal as well as yearly variations in the quadrantid meteor shower activity have been studied.
  • Meteoric activity over a low latitude station, Hyderabad 
    Yellaiah, G; Lokanadham, B (Astronomical Society of India, 1993)
    he radio observations of sporadic meteors, carried out during the period 1983-88, have been studied.
  • Spectrophotometric observations of the comet Swift-Tuttle (1992t) 
    Sanwal, B. B; Rautela, B. S; Mahendra Singh; Srivastava, J. B (Astronomical Society of India, 1993)
    Periodic comet Swift-Tuttle (1992t) period 135 years was observed with 104 cm reflector of Uttar Pradesh State Observatory, Naini Tal, using OMA (Optical Multichannel Analyser) reticon array detector in the visible region ...

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