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Browsing by Author "Ramesh, R"

Browsing by Author "Ramesh, R"

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  • Estimation of magnetic field in the solar coronal streamers through low frequency radio observations 
    Ramesh, R; Kathiravan, C; Sastry, Ch. V (Institute of Physics, 2010-03)
    The observations of circularly polarized thermal radio emission from solar coronal streamers at two low frequencies, viz., 77 and 109 MHz, are used to estimate the magnetic field strength (B) at their corresponding radial ...
  • An estimation of the plasma parameters in the solar corona using quasi-periodic metric type III radio burst emission 
    Ramesh, R; Satya Narayanan, A; Kathiravan, C; Sastry, Ch. V; Shankar, N. U (EDP Sciences, 2005-02)
    We report radio observations of quasi-periodic type III burst emission from the solar corona in close association with the 2B/X2.8 flare of December 11, 2001 at two frequencies (151.5 and 109 MHz). The measured mean period ...
  • Estimation of the Three-Dimensional Space Speed of a Coronal Mass Ejection Using Metric Radio Data 
    Kathiravan, C; Ramesh, R (The American Astronomical Society, 2004-07)
    We present an independent method for obtaining the three-dimensional space speed of a coronal mass ejection in the lower solar atmosphere through ray-tracing analysis of the thermal radio counterpart of its frontal loop ...
  • The First Low-frequency Radio Observations of the Solar Corona on ≈200 km Long Interferometer Baseline 
    Mugundhan, V; Ramesh, R; Kathiravan, C; Gireesh, G. V. S; Anshu Kumari; Hariharan, K; Barve, Indrajit V (IOP Publishing, 2018-03-01)
    The angular size of the smallest, compact radio source that can be observed in the solar atmosphere is one of the intriguing questions in low-frequency radio astronomy. This is important to understand density turbulence ...
  • 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.
  • Gauribidanur low-frequency solar spectrograph 
    Kishore, P; Kathiravan, C; Ramesh, R; Rajalingam, M; Barve, Indrajit V (Springer, 2014-10)
    A new radio spectrograph, dedicated to observe the Sun, has been recently commissioned by the Indian Institute of Astrophysics (IIA) at the Gauribidanur Radio Observatory, about 100 km North of Bangalore. The instrument, ...
  • 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 ...
  • Global sausage and kink modes in coronal loops 
    Anasooya Ashok; Satya Narayanan, A; Ramesh, R; Kathiravan, C (Anita Publications, 2004)
  • The Halo CME Event Of 23 October 1997 - Low-Frequency Radio Observations Of The Pre-Event Corona 
    Ramesh, R (Springer, 2000-09)
    We report low-frequency observations of an enhancement in the solar corona prior to the halo coronal mass ejection of 23 October 1997, with the Gauribidanur radioheliograph. The Sun was `quiet' and no radio bursts were ...
  • High Angular Resolution Radio Observations of a Coronal Mass Ejection Source Region at Low Frequencies during a Solar Eclipse 
    Ramesh, R; Kathiravan, C; Barve, Indrajit V; Rajalingam, M (IOP Publishing, 2012-01-10)
    We carried out radio observations of the solar corona in the frequency range 109-50 MHz during the annular eclipse of 2010 January 15 from the Gauribidanur Observatory, located about 100 km north of Bangalore in India. The ...
  • 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 dynamic range observations of solar coronal transients at low radio frequencies with a spectro-correlator 
    Hariharan, K; Ramesh, R; Kathiravan, C; Abhilash, H. N; Rajalingam, M (IOP Publishing, 2016-02)
    A new antenna system with a digital spectro-correlator that provides high temporal, spectral, and amplitude resolutions has been commissioned at the Gauribidanur Observatory near Bangalore in India. Presently, it is used ...
  • Identification of the Source Region of a ``Halo'' Coronal Mass Ejection Using Meter-Wavelength Radio Data 
    Kathiravan, C; Ramesh, R (The American Astronomical Society, 2005-07)
    We present meter-wavelength observations of the solar corona close to the onset of the ``halo'' coronal mass ejection (CME) of 1998 January 21 and estimate the change in electron density with time through a reproduction ...
  • Interfacial hydromagnetic waves with shear and inclined magnetic fields 
    Satya Narayanan, A; Ramesh, R (Astronomical Society of India, 2002-09)
    The combined effect of non-parallel propagation, steady :flow and inclined magnetic field on the . propagation characteristics of hydromagnetic surface waves is examined. The fluid is assumed to be perfectly conducting ...
  • Kink oscillations in the solar corona 
    Satya Narayanan, A; Ramesh, R; Kathiravan, C; Ebenezer, E (Astronomical Society of the Pacific, 2004-12)
    The solar coronal plasma is highly structured in the magnetic field, density and temperature. This plays a crucial role in the theory of MHD oscillations. In this study, we model a coronal loop to be made up of a cylindrical ...
  • Kodaikanal solar observatory radio spectrograph 
    Barve, Indrajit V; Kathiravan, C; Gireesh, G. V. S; Anand, M. N; Rajesh, M; Rajalingam, M; Ebenezer, E; Ramesh, R (Springer Nature B.V., 2021-09)
    The Indian Institute of Astrophysics (IIA) has commissioned a low frequency (<100 MHz) spectrograph at its Kodaikanal Solar Observatory (KSO) for coordinated observations of transients in the solar atmosphere with other ...
  • The location of solar metric type ii radio bursts with respect to the associated coronal mass ejections 
    Ramesh, R; Anna Lakshmi, M; Kathiravan, C; Gopalswamy, N; Umapathy, S (IOP Publishing, 2012-06-20)
    Forty-one solar type II radio bursts located close to the solar limb (projected radial distance rlesssim 0.8Rbigdot) were observed at 109 MHz by the radioheliograph at the Gauribidanur observatory near Bangalore during the ...
  • Long-Wavelength Observations of Jets from Polar Regions of the Sun 
    Ramesh, R (Kluwer Academic Publishers, 1999-10)
    We report radio observations of enhanced emission associated with the extreme-ultraviolet (EUV) jets from polar coronal hole regions of the Sun, with the Gauribidanur radioheliograph (GRH). We have estimated the brightness ...
  • 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 ...

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