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  • Origin of the society 
    Letton, C. T., ed., (Astronomical Society of India, 1910-11)
  • Origin of the Solar Rotation Harmonics Seen in the EUV and UV Irradiance 
    Giono, G; Zender, J. J; Kariyappa, R; Dame, L (Springer, 2021-11)
    Long-term periodicities in the solar irradiance are often observed with periods proportional to the solar rotational period of 27 days. These periods are linked either to some internal mechanism in the Sun or said to be ...
  • The origin of the solar system 
    Abhyankar, K. D (Astronomical Society of India, 1998)
  • Origin of the Solar System: Problems and Perspectives 
    De, Bibhas R (Astronomical Society of India, 1975-09)
  • Oscillating Transient X-Ray Source 
    Apparao, K. M. V (Astronomical Society of India, 1975-06)
  • Oscillations and heating in chromospheric fine scale structures 
    Kariyappa, R (Astronomical Society of the Pacific, 1999)
    We have analyzed a 35-min-long time sequence of spectra obtained simultaneously in CaII H-line, NaI D1 and D2 lines, and in strong and weak FeI lines in a quiet region at; the center of the solar disc under high spatial, ...
  • Oscillations in active region fan loops: observations from EIS/Hinode and AIA/SDO 
    Krishna Prasad, S; Banerjee, D; Singh, J (Springer, 2012-11)
    Active region fan loops in AR 11076 were studied, in search of oscillations, using high cadence spectroscopic observations from Extreme-ultraviolet Imaging Spectrometer (EIS) on board Hinode combined with imaging sequences ...
  • Oscillations in F-region doppler velocity in the dip equatorial region associated with ULF geomagnetic pulsations 
    Sastri, J. H; Ramesh, K. B; Rao, D. R. K; Rao, J. V. S. V (Elsevier Science, 1993-07)
    Measurements are presented, made on March 24, 1991 over the Kodaikanal, showing that, around sunset, the Doppler velocity of F-region reflections at vertical incidence is influenced by MHD waves, the magnetic effects of ...
  • Oscillations In Galaxies 
    Namboodiri, P. M. S (Springer, 2000-02)
    Oscillations in galaxies have been investigated by numerical simulations. The various models used have density distributions corresponding to that of polytrope of index n in the range 0 ≤ n ≤ 4 and their evolution has been ...
  • Oscillations In Galaxies 
    Namboodiri, P. M. S (Kluwer Academic Publishers, 2000-01)
    Oscillations in galaxies have been investigated by numerical simulations. The various models used have density distributions corresponding to that of polytrope of index n in the range 0 ≤ n ≤ 4 and their evolution has been ...
  • Oscillatory motions in intense flux tubes 
    Hasan, S. S (Royal Astronomical Society, 1986-03)
    The intricate nature of oscillatory motions in intene flux tubes is examined and states in which the ratio of gas to magnetic pressure (Beta) is constant are considered. Results are presented for both polytropic and real ...
  • Our Present Understanding of Solar Flares 
    Dwivedi, B. N (Indian Institute of Astrophysics, Bangalore, 1986)
    A general discussion of solar flares with emphasis on two-ribbon flares is given. The basic differences between compact (simple-loop) and two-ribbon flares have also been pointed. Skylab observations have been presented ...
  • The outburst and nature of young eruptive low mass stars in dark clouds 
    Ninan, J. P; Ojha, D. K; Bhatt, B. C; Mallick, K. K; Tej, A; Sahu, D. K; Ghosh, S. K; Mohan, V (Astronomical Society of India, 2012)
    The FU Orionis (FUor) or EX Orionis (EXor) phenomenon has attracted increasing attention in recent years and is now accepted as a crucial element in the early evolution of low-mass stars. FUor and EXor eruptions of young ...
  • Outbursts of Comet 67P/Churyumov-Gerasimenko 
    Sharma, Kritti; Kelley, Michael S. P; Joharle, Simran; Kumar, Harsh; Swain, Vishwajeet; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu (IOP Publishing, 2021-12)
    We monitored the comet 67P/Churyumov-Gerasimenko close to its perihelion in November 2021 with the GROWTH-India Telescope. We observed two outbursts of this comet on 2021 October 29.940 and November 17.864 UTC, -3.12 days ...
  • Outer rings of Saturn 
    Bhattacharyya, J. C; Vasundhara, R (Indian Academy of Sciences, 1985)
    A two component model of a possible ring structure at about 12.5 Saturn radii is presented here which can explain the shapes of the immersion and emersion occultation profiles obtained during the occultation of SAO 158913 ...
  • Outflowing Atmospheres Across the HR Diagram 
    Underhill, A. B (Astronomical Society of India, 1978-09)
    The principle factors governing the modelling of stellar atmosphere are reviewed, and it is noted that modern observations, which span wavelengths from 1000 /sup0/A to several mm, reveal parts of stars which are not included ...
  • Outgassing Behavior of C/2012 S1 (ISON) from 2011 September to 2013 June 
    Meech, K. J; Yang, B; Kleyna, J; Ansdell, M; Chiang, H. F; Hainaut, O; Vincent, J. B; Boehnhardt, H; Fitzsimmons, A; Rector, T; Riesen, T; Keane, J. V; Reipurth, B; Hsieh, H. H; Michaud, P; Milani, G; Bryssinck, E; Ligustri, R; Trabatti, R; Tozzi, G. P; Mottola, S; Kuehrt, E; Bhatt, B. C; Sahu, D. K; Lisse, C; Denneau, L; Jedicke, R; Magnier, E; Wainscoat, R (IOP Publishing, 2013-10-20)
    We report photometric observations for comet C/2012 S1 (ISON) obtained during the time period immediately after discovery (r = 6.28 AU) until it moved into solar conjunction in mid-2013 June using the UH2.2 m, and Gemini ...
  • Outline of work for the general section 
    The Director of the Section (Astronomical Society of India, 1910-12)
  • Outline of work for the lunar section 
    Mitchell, J (Astronomical Society of India, 1910-11)
  • Outline of work on variable Stars 
    The Director of the Section (Astronomical Society of India, 1910-12)

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