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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Observations on spread-F at Kodaikanal 
    Sastri, J. H; Murthy, B. S (National Institute of Science Communication And Information Resources, 1975-06)
    A study of quarter-hourly ionograms of Kodaikanal (geomag. lat: O'6oN; dip: 3'5°N) showed several instances when the spread-F disappears and subsequently. reappears in two hrs or less during it night. Investigation of such ...
  • Observations on the Fine Structures in Solar Decametric Radio Emission 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V (Indian Institute of Astrophysics, Bangalore, 1984)
    The Solar decametric radio emission consists of a variety of fine structures. This reflects the complexity of the corona at this level. Two observations, viz. absorption bursts and short duration narrow band bursts are ...
  • Observations on the occultation of the radio source Tauras A by the solar corona during June 1971 
    Sastry, Ch. V; Subramanian, K. R (National Institute of Science Communication and Information Resources, 1974-09)
    Observations on the occultation of the radio source Tamas A (3C 144) during June 1971 at a wavelength of 12 m are presented. It is tentatively observed that there is no strong dependence between the amount of scattering and ...
  • Observations on the slowly varying component of solar radio emission at decameter wavelengths 
    Sastry, Ch. V; Shevgaonkar, R. K; Ramanuja, M. N (Springer, 1983-09)
    The authors have made two-dimensional maps of the slowly varying component (SVC) of solar radio emission at a frequency of 34.5 MHz with half power beam width of 26'/40'. It is found that a majority of SVC sources have ...
  • Observations on the Time and Frequency Structure of Solar Decameter Radio Bursts 
    Sastry, Ch. V (D. Reidel Publishing Co., 1973-01)
    Solar radio bursts were observed with a 4-channel radiometer and polarization analyser at wavelenghts around 12 m. The time and frequency resolutions were 10 ms and 100 kHz respectively. Observations on the duration, time ...
  • Observations on the time structure of solar radio bursts at a wavelength of 12 M 
    Sastry, Ch. V (D. Reidel Publishing Company, 1969-12)
  • Observations on the Unusual States in the Normal Patterns of the Private Behavior During the Total Solar Eclipse 
    Parthasarathy, M. D; Kulkarni, A. G (Indian Institute of Astrophysics, Bangalore, 1997)
    Systematically planned observations conclusively reveal that sudden and large natural changes in the ambient light conditions during a total solar eclipse for a few minutes, initiates and cause marked alterations in the ...
  • Observations with the 3.6-meter Devasthal optical telescope 
    Sagar, R; Kumar, B; Sharma, S (Indian Academy of Sciences, 2020-12)
    The 3.6-meter Indo–Belgian Devasthal optical telescope (DOT) has been used for optical and near-infrared (NIR) observations of celestial objects. The telescope has detected stars of B=24.5±0.2,R=24.6±0.12 and g=25.2±0.2 ...
  • Observations with the High Altitude GAmma Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S; Vishwanath, P. R; Yadav, K. K (French Society of Astronomy and Astrophysics, 2010-12)
    For several decades, it was thought that astrophysical sources emit high energy photons within the energy range of the gamma-ray region of the lectromagnetic spectrum also. These photons originate from interactions of high ...
  • Observations with the High Altitude GAmma-Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Manoharan, J; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S. S; Vishwanath, P. R; Yadav, K. K (Copernicus Publications, 2011-11)
    The High Altitude GAmma-Ray (HAGAR) array is a wavefront sampling array of 7 telescopes, set-up at Hanle, at 4270 m amsl, in the Ladakh region of the Himalayas (Northern India). It constitutes the first phase of the HImalayan ...
  • Observed polarization of brown dwarfs suggests low surface gravity 
    Sengupta, S; Marley, M. S (IOP Publishing, 2010-10-20)
    Light scattering by atmospheric dust particles is responsible for the polarization observed in some L dwarfs. Whether this polarization arises from an inhomogeneous distribution of dust across the disk or an oblate shape ...
  • Observing the GRB remnants 
    Bhargavi, S. G; Cowsik, R; Perna, R (Astronomical Society of the Pacific, 2004-06)
    Following the predictions of Perna, Reymond & Loeb (2000) we have proposed an observational program to search for the GRB remnants in nearby galaxies using the telescopes of Indian Institute of Astrophysics, Bangalore. We ...
  • Occultation of 2UCAC 42376428 by (423) Diotima on 2005 March 06 
    Vasundhara, R; Kuppuswamy, K; Ramamoorthy, S; Velu, C; Venkataramana, A. K (Astronomical Society of India, 2006-03)
    Observations of the occultation of the star 2UCAC 42376428 by (423) Diotima on 2005 March 06 at the Vainu Bappu Observatory are reported. The observed mid time of the event at 15:12:25.1 UT occurred 3.4 s later than the ...
  • Occultation of a solar active region at 1.5 GHz during the eclipse of November 3, 1994 
    Subramanian, K. R; Sawant, H. S; Fernandes, F. C. R; Cecatto, J. R (EDP Sciences, 2006-03)
    We observed the solar eclipse of November 3, 1994 with a 4-m diameter antenna and a radio spectrograph operating at 1.5 ± 0.05 GHz with a time resolution of 100 ms. Here we present the observations of the occultation of ...
  • Occultation of SAO 185428 by 336 Lacadiera 
    Paranjpye, A; Babu, G. S. D (Indian Academy of Sciences, 1986)
  • Occultation: A precise method in astronomical studies 
    Bhattacharyya, J. C (Indian Academy of Sciences, 1982-05-09)
  • Occultations by possible material in Saturn's outer magnetosphere 
    Vasundhara, R (Indian Academy of Sciences, 1988-03)
    Results are presented of a search in the SAO catalogue for occultations of stars by Saturn's magnetosphere occurring during 1988. The instantaneous apparent position of the star, angle of inclination of the ring plane to ...
  • Occultations by possible material in Saturn's outer magnetosphere. II 
    Vasundhara, R (Indian Academy of Sciences, 1989-03)
    Results of a search for occultations of stars in the SAO catalog by Saturn's outer magnetosphere during 1989-1990 are presented. A total of nine events are predicted to occur during this period. The most favorable event ...
  • Occurrence of abnormal Sq (H) phase in the equatorial electrojet region 
    Sastri, J. H (Pergamon Press Ltd., 1981-07)
    From an analysis of published geomagnetic data of stations in the Indian equatorial region, it is shown that on days with an abnormal Sq (H) phase limited to the electrojet belt, conditions characteristic of complete or ...
  • Occurrence of M and N echoes at the equatorial station, Kodaikanal 
    Sastri, J. H; Murthy, B. S (National Institute of Science Communication And Information Resources, 1975-03)
    Results are presented from a study on the occurrence of M and N traces on ionograms at the equatorial station Kodaikanal, with particular reference to their associations with various sporadic configurations. It is shown ...

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