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Browsing by Author "Sastry, Ch. V"

Browsing by Author "Sastry, Ch. V"

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  • Fine structure in solar decametric radiation 
    Thejappa, G; Sastry, Ch. V; Gopalswamy, N (Harwood Academic Publishers, 1984)
    Observations and interpretations of some of the fine structure in decametric solar radio emission -such as (1) the time structure of type III bursts, (2) absorption bursts, and (3) slowly drifting spikes -are presented. ...
  • 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.
  • The frequency drift and time splitting of decameter solar radio bursts 
    Sastry, Ch. V (Gordon and Breach, Science Publishers Ltd., 1972-05)
    The frequency drift and time splitting of solar radio bursts are observed with a multi-channel radiometer and a polarimeter at frequencies around 25 MHz. It is found that a majority of noise storm bursts have drift ...
  • The Gauribidanur radio observatory 
    Sastry, Ch. V (National Institute of Science Communication and Information Resources, 1989-08)
    The Raman Research Institute and the Indian Institute of Astrophysics in a joint collaboration program operate the Gauribidanur radio observatory. Details of the various antenna arrays and receiver systems available at the ...
  • 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 ...
  • Imaging With The Mauritius Radio Telescope Challenges and Results 
    Udaya Shankar, N; Golap, K; Sachdev, S; Dodson, R; Katwaroo, M; Sastry, Ch. V (Springer, 2002)
    The Mauritius Radio Telescope (MRT) has been built with the main objective of surveying the southern sky at meter wavelengths. MRT is a Fourier synthesis, T-shaped non-coplanar array. It consists of a2048 m long East-West ...
  • Indian Institute of Astrophysics Annual Report: 1990-91 
    Sastry, Ch. V (Indian Institute of Astrophysics, 1991)
  • A Large Decametric Wavelength Antenna Array for IPS Observations of Radio Sources 
    Sastry, Ch. V (International Astronomical Union, 1980)
  • Low frequency (< 100 MHz) thermal radio emission from the solar corona and the effect of radial magnetic field 
    Ramesh, R; Sastry, Ch. V (Astronomical Society of the Pacific, 2005-12)
    We measured the degree of circular polarization of the thermal radiation from discrete structures in the solar corona at a frequency of 77 MHz and attempted to derive the magnetic field strength of these regions.
  • 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 ...
  • A low frequency radio telescope at Mauritius for a southern sky survey. 
    Golap, K; Shankar, N. U; Sachdev, S; Dodson, R; Sastry, Ch. V (Indian Academy of Sciences, 1998-06)
    A new, meter-wave radio telescope has been built in the north-east of Mauritius, an island in the Indian Ocean, at a latitude of -20.14°. The Maritius Radio Telescope is a Fourier Synthesis T-shaped array, consisting of a ...
  • A low-frequency (30-110 MHz) Antenna system for observations of polarized radio emission from the solar corona 
    Ramesh, R; Kathiravan, C; Sundararajan, M. S; Barve, Indrajit V; Sastry, Ch. V (Springer Netherlands, 2008-12)
    An interferometer antenna system to observe polarized radio emission from the solar corona at different frequencies in the range 30-110 MHz has been commissioned recently by the Indian Institute of Astrophysics at the ...
  • Low-Frequency Radio Observations of the Angular Broadening of the Crab Nebula Due to a Coronal Mass Ejection 
    Ramesh, R; Kathiravan, C; Sastry, Ch. V (The American Astronomical Society, 2001-02)
    We report two-dimensional, low-frequency radio observations of the angular broadening of the Crab Nebula (Taurus A) due to a coronal mass ejection (CME), at a distance of ~41 Rsolar from the Sun. The estimated electron ...
  • 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 ...
  • The Mauritius Radiotelescope 
    Golap, K; Issur, N. H; Somanah, R; Dodson, R; Modgekar, M; Sachdev, S; Shankar, N. Udaya; Sastry, Ch. V (Springer Netherlands, 1995-06)
    The Mauritius Radiotelescope (MRT) is a T-shaped array of helical antennas with a 2048 m EW arm and a 890 m South arm. The primary objective of the telescope is to produce a sky survey in the declination zone -15° to -65° ...
  • Metric Radio Observations of the Evolution of a ``Halo'' Coronal Mass Ejection Close to the Sun 
    Ramesh, R; Kathiravan, C; Sastry, Ch. V (The American Astronomical Society, 2003-07-10)
    We report direct imaging observations of the propagation of a diffuse thermal radio enhancement in close temporal and spatial association with a ``halo'' coronal mass ejection from the solar atmosphere, in the metric ...
  • A new digital spectrograph for observations of radio burst emission from the Sun 
    Ebenezer, E; Ramesh, R; Subramanian, K. R; Sundararajan, M. S; Sastry, Ch. V (EDP Sciences, 2001-03)
    A new digital spectrograph for obtaining a dynamic spectrum of radio burst emission from the Sun in the frequency range 30-80 MHz has been recently commissioned at the Gauribidanur Radio Observatory (Lat: 13degr ...
  • A new investigation of microbursts at meter-decameter wavelengths 
    Subramanian, K. R; Gopalswamy, N; Sastry, Ch. V (Kluwer Academic Publishers, 1993-02)
    The results of a new investigation of microbursts at meter-decameter wavelengths are reported. Several properties of microbursts reported earlier are confirmed, and some new properties, such as time profile characteristics, ...

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