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Browsing by Author "Ramesh, R"

Browsing by Author "Ramesh, R"

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  • Polarization Observations of a Split-band Type II Radio Burst from the Solar Corona 
    Ramesh, R; Kathiravan, C (American Astronomical Society, 2022-11-20)
    Using temporal observations of circular polarized harmonic plasma emission from a split-band type II solar radio burst at 80 MHz, we separately estimated the coronal magnetic field strengths (B) associated with the lower ...
  • The Post-Coronal Mass Ejection Solar Atmosphere and Radio Noise Storm Activity 
    Kathiravan, C; Ramesh, R; Nataraj, H. S (University of Chicago Press., 2007-02)
    We carried out a statistical study of solar radio noise storms whose onset was in the aftermath of coronal mass ejections (CMEs) that occurred during 1997–2004, the first half of present solar cycle 23. The work is an ...
  • Proposed visible emission line space solar coronagraph 
    Singh, J; Prasad, B. R; Venkatakrishnan, P; Sankarasubramanian, K; Banerjee, D; Bayanna, R; Mathew, S; Murthy, J; Subramaniam, P; Ramesh, R; Kathiravan, S; Nagabhushana, S; Mahesh, P. K; Manoharan, P. K; Uddin, W; Sriram, S; Amit Kumar; Srivastava, N; Koteswara Rao; Nagendra, C. L; Chakraborty, P; Sriram, K. V; Venkateswaran, R; Krishnamurthy, T; Sreekumar, P; Sarma, K. S; Murthy, R; Navalgund, K. H; Samudraiah, D. R. M; Narayan Babu, P; Patra, A (Indian Academy of Sciences, 2011-01-25)
    The outer atmosphere of the sun – called the corona – has been observed during total solar eclipse for short periods (typically < 6 min), from as early as the eighteenth century. In the recent past, space-based instruments ...
  • Prototype for pulsar observations at low radio frequencies using log-periodic dipole antennas 
    Bane Kshitij, Suhas Trupti; Barve, Indrajit V; Gireesh, G. V. S; Kathiravan, C; Ramesh, R (SPIE-The International Society for Optical Engineering, 2022-01)
    A prototype for dedicated observations of pulsars and other astrophysical transients in the frequency range of 50 to 80 MHz has been recently commissioned in the Gauribidanur Radio Observatory near Bangalore in India. ...
  • Radio interferometric observations of the Sun using commercial dish TV antennas 
    Gireesh, G. V. S; Kathiravan, C; Barve, Indrajit V; Ramesh, R (Springer, 2021-08)
    The radio astronomy group in the Indian Institute of Astrophysics (IIA) has been carrying out routine observations of radio emission from the solar corona at low frequencies (≈40 – 440 MHz) at the Gauribidanur observatory, ...
  • Radio observations of a coronal mass ejection induced depletion in the outer solar corona 
    Ramesh, R; Sastry, Ch. V (European Southern Observatory, 2000-06)
    We report the first low frequency radio observations of a depletion that occurred in the outer solar corona in the aftermath of the CME event of 1986 June 5, with the large E-W one dimensional grating interferometer at the ...
  • Radio Observations of Compact Sources in the Outer Solar Corona 
    Ramesh, R; Subramanian, K. R; Sastry, Ch. V (Indian Institute of Astrophysics, Bangalore, 1997)
    We have observed radio emission from the solar corona at a frequency of 77 MHz during the total solar eclipse on October 24, 1995 from our observatory at Gauribidanur. Sources of angular sizes less than or equal to 1.5' ...
  • Radio Observations of the Solar Corona During an Eclipse 
    Kathiravan, C; Ramesh, R; Barve, Indrajit V; Rajalingam, M (Institute of Physics Publishing, 2011-04-01)
    We carried out radio observations of the solar corona at 170 MHz during the eclipse of 2008 August 1, from the Gauribidanur observatory located about 100 km north of Bangalore in India. The results indicate the presence ...
  • Radio observations of weak energy releases in the solar corona 
    Ramesh, R; Kathiravan, C; Barve, Indrajit V; Beeharry, G. K; Rajasekara, G. N (IOP Science, 2010-08-10)
    We report observations of weak, circularly polarized, structureless type III bursts from the solar corona in the absence of Hα/X-ray flares and other related activity, during the minimum between the sunspot cycles 23 and ...
  • Radio spectrum measurements at the Gauribidanur observatory 
    Monstein, C; Ramesh, R; Kathiravan, C (Astronomical Society of India, 2007-12)
    During a campaign in December 2006, radio spectrum measure- ments over the frequency range 45-870 MHz were carried out at the Gauribida- nur observatory, located about 100 km north of Bangalore. The spectrometer used for ...
  • Radio, X-ray, and extreme-ultraviolet observations of weak energy releases in the "Quiet" sun 
    Ramesh, R; Kathiravan, C; Mithun, N. P. S; Vadawale, S. V (IOP Publishing, 2021-09-01)
    We analyzed ground-based low frequency (<100 MHz) radio spectral and imaging data of the solar corona obtained with the facilities in the Gauribidanur observatory during the same time as the very weak soft X-ray flares ...
  • Radioheliograph observations of metric Type II bursts and the kinematics of coronal mass ejections 
    Ramesh, R; Kathiravan, C; Sreeja S. K; Gopalswamy, N (Institute of Physics, 2010-03-20)
    Assuming that metric type II radio bursts from the Sun are due to magnetohydrodynamic shocks driven by coronal mass ejections (CMEs), we estimate the average CME acceleration from its source region up to the position of ...
  • Seismology of the solar corona through observations of metric type IV radio burst emission 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A (Anita Publications, 2004)
    We present metric radio observation of a transient. quasi-periodic type IV burst emission from the solar corona following the hard X-ray/H¦Á flare of November 23, 2000. The radio event lasted for about 121s, and the ...
  • Simultaneous near-sun observations of a moving type IV radio burst and the associated white-light coronal mass ejection 
    Hariharan, K; Ramesh, R; Kathiravan, C; Wang, T. J (Springer, 2016-05)
    We present rare contemporaneous low-frequency (< 100 MHz) imaging, spectral, and polarimetric observations of a moving type IV radio burst that had close spatio-temporal association with a white-light coronal mass ejection ...
  • Solar Coronal Density Turbulence and Magnetic Field Strength at the Source Regions of Two Successive Metric Type II Radio Bursts 
    Ramesh, R; Kathiravan, C; Anshu Kumari (American Astronomical Society, 2023-01-20)
    We report spectral and polarimeter observations of two weak, low-frequency (≈85–60 MHz) solar coronal type II radio bursts that occurred on 2020 May 29 within a time interval ≈2 minutes. The bursts had fine structures, ...
  • Solar Radio Spectro-polarimeter (50–500 MHz). I. Design, Development, and Characterization of a Cross-polarized, Log-periodic Dipole Antenna 
    Kumari, Anshu; Gireesh, G. V. S; Kathiravan, C; Mugundhan, V; Barve, Indrajit V; Ramesh, R; Monstein, C (American Astronomical Society, 2023-12-01)
    The Zeeman effect has been routinely used to image and quantify the solar photospheric magnetic field (B). Such a direct measuring technique is not yet available for the corona (Lin et al. 2004). Since almost all ...
  • Solar Type IIIb Radio Bursts as Tracers for Electron Density Fluctuations in the Corona 
    Mugundhan, V; Hariharan, K; Ramesh, R (Springer, 2017-11)
    We present an estimation of the electron density modulation index ( δN Nee ) for the first time using solar type IIIb radio burst observations. The mean value of δN Nee is calculated to be ≈ 0.006 ± 0.002 over the ...
  • Some initial results from the Gauribidanur radio heliograph 
    Ramesh, R; Subramanian, K. R; Sastry, Ch. V (Astronomical Society of India, 1998)
    Observations of the sun at two frequencies (51 and 77 MHz)using the East-West arm of the Gauribidanur Radio heliograph are presented.
  • Southern hemisphere solar radio heliograph 
    Sawant, H. S; Fernandes, F. C. R; Neri, J. A. C. F; Cecatto, J. R; Faria, C; Stephany, S; Rosa, R. R; Andrade, M. C; Ludke, E; Subramanian, K. R; Ramesh, R; Sundrarajan, M. S; Sankararaman, M. R; Ananthakrishnan, S; Swarup, G; Boas, J. W. V; Botti, L. C. L; Moron, C. E; Saito, J. H; Karlicky, M (European Space Agency, 2002-12)
    The Brazilian Decimetric Array (BDA) is being developed at National Institute for Space Research (INPE) as an international collaborative program. Initially, the BDA will operate in the tuneable frequency range of 1.2-1.7 ...
  • Spectropolarimetric Observations of Solar Noise Storms at Low Frequencies 
    Mugundhan, V; Ramesh, R; Kathiravan, C; Gireesh, G. V. S; Aathira Hegde (Springer, 2018-03)
    "A new high-resolution radio spectropolarimeter instrument operating in the frequency range of 15 – 85 MHz has recently been commissioned at the Radio Astronomy Field Station of the Indian Institute of Astrophysics ...

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