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Browsing by Author "Subramanian, K. R"

Browsing by Author "Subramanian, K. R"

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  • Absorption bursts in the radio emission from the sun at decameter wavelengths 
    Sastry, Ch. V; Subramanian, K. R; Krishan, V (Gordon and Breach Science Publishers, 1983)
    Some characteristics of sudden decreases in the observed radio emission from the sun at decameter wavelengths are presented, and possible interpretations are discussed. These 'absorption bursts' occurred during periods of ...
  • Brazilian Decimetric Array (Phase-I) 
    Sawant, H. S; Ramesh, R; Cecatto, J. R; Faria, C; Fernandes, F. C. R; Rosa, R. R; Andrade, M. C; Stephany, S; Cividanes, L. B. T; Miranda, C. I. A; Botti, L. C. L; Boas, J. W. S. V; Saito, J. H; Moron, C. E; Mascarenhas, N. D; Subramanian, K. R; Sundararajan, M. S; Ebenezer, E; Sankararaman, M. R (Springer Netherlands, 2007-05)
    An East – West, one-dimensional radio interferometer array consisting of five parabolic dish antennas has been set up at Cachoeira Paulista (longitude 45°0′20″ W, latitude 22°41′19″ S) for observations of the Sun and some ...
  • Brightness temperature and size of the quiet Sun at 34.5 MHz 
    Subramanian, K. R (EDP Sciences, 2004-10)
    We present observations of the quiet Sun made at 34.5 MHz during the solar minimum period June-July 1986 and May-June 1987 with the Gauribidanur radio telescope and a grating array. The brightness temperature of the quiet ...
  • A Broadband Low Frequency Radio Telescope at Gauribidanur 
    Subramanian, K. R; Nanje gowda, C; Hameed, A. T. A; Sastry, Ch. V (Astronomical Society of Indian, 1986-12)
    A broadband radio telescope operating at decameter wavelengths built at Gauribidanur India, primarily for the study of solar radio emission, is described.
  • Coronal magnetic field estimation using type-II radio bursts 
    Subramanian, K. R; Ebenezer, E; Raveesha, K. H (Springer, 2010)
    Coronal magnetic fields at two different heights were estimated using multiple type-II radio bursts observed on 23 January 2003. The strength of the magnetic field was estimated using 1–5 times the Newkirk density value. ...
  • Decametric radio spectra of some galaxies in clusters 
    Subramanian, K. R; Sastry, Ch. V (Astronomical Society of Indian, 1988-12)
    Observations of 12 radio sources identified with clusters of galaxies were made in 1983-84 with a decameter-wave radio telescope. The measured flux densities at 34.5 MHz are combined with other low frequency measurements ...
  • Diffuse echo bursts at 34.5 MHz 
    Subramanian, K. R (Indian Institute of Astrophysics, Bangalore, 1988)
    The solar radio bursts during their propagation towards the earth are refracted, scattered, reflected and absorbed. The combination of these effects play a role in determining the source size, position, brightness temperature ...
  • Eclipse Observations of Compact Sources in the Outer Solar Corona 
    Ramesh, R; Subramanian, K. R; Sastry, Ch. V (Kluwer Academic Publishers, 1999-03)
    We report here on high angular resolution observations of solar noise storm sources at a frequency of 75MHz. The data for the study were obtained at the Gauribidanur Radio Observatory (long.: 77 deg26'12''E, lat.: 13 ...
  • Estimation of magnetic field in the solar coronal streamers through low frequency radio observations 
    Ramesh, R; Subramanian, K. R; Sastry, Ch. V (Gordon Breach Science, 2000)
  • First results from the Gauribidanur Radio heliograph 
    Subramanian, K. R; Ramesh, R; Sundararajan, M. S; Sastry, Ch. V (Kluwer Academic Publishers, 1996-03)
    Observations of the Sun at two frequencies (51 and 77 MHz) using the East-West arm of the Gauribidanur Radio heliograph are presented.
  • Frequency and time profiles of metric wave isolated Type I solar noise storm bursts at high spectral and temporal resolution 
    Sundaram, G. A. S; Subramanian, K. R (Royal Astronomical Society, 2005-05)
    Type I noise storms constitute a sizeable fraction of the active Solar radio emission component. Observations of isolated instances of such bursts, in the swept-frequency mode at metric wavelengths, have remained sparse, ...
  • Gauribidanur radio array solar spectrograph (GRASS) 
    Ebenezer, E; Subramanian, K. R; Ramesh, R; Sundararajan, M. S; Kathiravan, C (Astronomical Society of India, 2007-06)
    We describe the Gauribidanur radio array solar spectrograph (GRASS) and its various systems. The system consists of an array of 8 log periodic dipoles,a spectrum analyzer and a data acquisition system. The spectrograph ...
  • The Gauribidanur Radioheliograph 
    Ramesh, R; Subramanian, K. R; Sundararajan, M. S; Sastry, Ch. V (Kluwer Academic Publishers, 1998-08)
    A new radio heliograph for obtaining two-dimensional images of the solar corona sequentially at many frequencies in the range 40-150 MHz has been built by the Indian Institute of Astrophysics at the Gauribidanur Radio ...
  • The Gauribidnur acousto optic spectrometer 
    Subramanian, K. R; Ebenezer, E; Sastry, Ch. V (Tata McGraw- Hill, 1994-07)
    An acousto optic spectrometer (ADS) with 30 MHz bandwidth and 1760 channels used for obtain-_ ing the dynamic spectra of solar radio bursts at Gauribidanur is described.
  • High Angular Resolution Radio Observations of the Outer Solar Corona 
    Ramesh, R; Subramanian, K. R; Sastry, Ch. V (Elsevier, 2000)
    We report high angular resolution observations of the outer solar corona carried out at 75 MHz from the Gauribidanur Radio Observatory (Long: 77°26'12" E, Lat: 13°36'12" N) about 100 km north of Bangalore, India, during ...
  • High Resolution Radio Spectroscopy of Continuum Radio Bursts at Decameter Wavelengths from the Sun 
    Subramanian, K. R (Indian Institute of Astrophysics, Bangalore, 1992-03)
  • A low cost steerable radio-telescope 
    Sawant, H. S; Neri, J. A. C. F; Fernandes, F. C. R; Cecatto, J. R; Sankararaman, M. R; Faria, C; Stephany, S; Rosa, R. R; Andrade, M. C; Alonso, E. M. B; Ludke, E; Subramanian, K. R; Ramesh, R; Sundararajan, M. S; Ananthakrishnan, S; Swarup, G; Boas, J. W. V; Botti, L. C. L; Moron, C. E; Saito, J. H (Elsevier B. V., 2003)
    We present the technical characteristics of a low-cost radio telescope for solar/non solar observations at decimetric (1200–1700 MHz) and centimetric (2700 and 5000 MHz) wavelengths known as Brazilian Decimetric Array ...
  • Low frequency radio observations of the solar corona prior to the onset of a mass ejection event 
    Ramesh, R; Subramanian, K. R; Sastry, Ch. V (European Space Agency, 1999-10)
    It is well known that the halo CMEs originating on the visible hemisphere of the Sun could give rise to the severest terrestrial consequences. Recent studies carried out with the YOHKOH soft X-ray data by various authors ...
  • The low-frequency radio spectrum of the continuum emission from the undisturbed sun 
    Subramanian, K. R; Sastry, Ch. V (Indian Academy Sciences, 1988-12)
    The low-frequency radio spectrum of the continuum emission from the undisturbed Sun is determined for 24 days during the period 1985 May - September. It is found that the spectral index varied from +1.6 to +3.6 during this ...
  • Lunar Occultation Observations of the Microwave Sun During the Eclipse of October 24, 1995 
    Bagchi, J; Subramanian, K. R; Ebenezer, E; Gowda, N; Abdul Hameed, A. T (Indian Institute of Astrophysics, Bangalore, 1997)
    The interpretation of the lunar occultation data recorded at the microwave frequencies of 2025, 3.80 and 4.20 GHz from two stations during the October 24, 1995 solar eclipse in India is presented.

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