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Browsing by Author "Ramesh, R"

Browsing by Author "Ramesh, R"

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  • A 1 bit Raw Voltage-recording System for Dedicated Observations of Transients at Low Radio Frequencies 
    Bane Kshitij, Suhas Trupti; Barve, Indrajit V; Gireesh, G. V. S; Kathiravan, C; Ramesh, R (American Astronomical Society, 2024-06)
    Recently we had reported commissioning of a prototype for pulsar observations at low radio frequencies (<100 MHz) using log-periodic dipole antennas in the Gauribidanur Radio Observatory (≈77°E, 14°N) near Bangalore in ...
  • The 1024 channel digital correlator receiver of the Gauribidanur radioheliograph 
    Ramesh, R; Sundararajan, M. S; Sastry, Ch. V (Springer, 2006-02)
    A low frequency (40 150 MHz) radioheliograph for observations of the solar corona is in operation for the last few years at the Gauribidanur radio observatory, about 100 km north of Bangalore. The array has 32 antenna ...
  • Alfven waves in a gravitational field with flows 
    Satya Narayanan, A; Kathiravan, C; Ramesh, R (Cambridge University Press, 2009-03)
    The gravitational stratification effect on magnetohydrodynamic waves at a single interface in the solar atmosphere has been studied in the penumbral region of the sunspot recently. The existence of slow and fast magneto ...
  • Amplitude of solar wind density turbulence from 10 to 45 R⊙ 
    Sasikumar Raja, K; Ingale, M; Ramesh, R; Subramanian, P; Manoharan, P. K; Janardhan, P (American Geophysical Union, 2016-12)
    We report on the amplitude of the density turbulence spectrum ( urn:x-wiley:jgra:media:jgra53108:jgra53108-math-0001) and the density modulation index (δN/N) in the solar wind between 10 and 45R⊙. We derive these quantities ...
  • Automated detection of solar radio bursts using a statistical method 
    Singh, D; Raja, K. S; Subramanian, P; Ramesh, R; Monstein, Christian (Springer, 2019-11)
    Radio bursts from the solar corona can provide clues to forecast space-weather hazards. After recent technology advancements, regular monitoring of radio bursts has increased and large observational datasets are produced. ...
  • Automated Detection of Solar Radio Bursts Using a Statistical Method 
    Singh, Dayal; Sasikumar Raja, K; Subramanian, Prasad; Ramesh, R; Monstein, Christian (Springer, 2019-08)
    adio bursts from the solar corona can provide clues to forecast space-weather hazards. After recent technology advancements, regular monitoring of radio bursts has increased and large observational datasets are produced. ...
  • Brazilian Decimetre Array (Phase-1): Initial solar observations 
    Ramesh, R; Sawant, H. S; Cecatto, J. R; Faria, C; Fernandes, F. C. R; Kathiravan, C; Suryanarayana, G. S (Elsevier B.V, 2007-02)
    An East–West one-dimensional radio interferometer array consisting of 5 parabolic dish antennas has been set-up at Cachoeira Paulista, Brazil (Longitude: 45°0′20″W, Latitude: 22°41′19″S) for observations of Sun and some ...
  • 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 ...
  • Circular Polarization Observations of Type II Solar Radio Bursts and the Coronal Magnetic Field 
    Ramesh, R; Kathiravan, C; Ebenezer, E (American Astronomical Society, 2022-06-10)
    It is well known that magnetic field strength (B) in the solar corona can be calculated using the Alfvén Mach number (MA) and Alfvén speed (vA) of the magnetohydrodynamic shock waves associated with coronal type II radio ...
  • Constraining the solar coronal magnetic field strength using split-band type ii radio burst observations 
    Kishore, P; Ramesh, R; Hariharan, K; Kathiravan, C; Gopalswamy, N (IOP Publishing, 2016-11-20)
    We report on low-frequency radio (85–35 MHz) spectral observations of four different type II radio bursts, which exhibited fundamental-harmonic emission and split-band structure. Each of the bursts was found to be closely ...
  • Coronal magnetic field lines and electrons associated with type IIIV radio bursts in a solar flare 
    Kishore, P; Kathiravan, C; Ramesh, R; Ebenezer, E (Indian Academy of Sciences, 2017-05)
    We recently investigated some of the hitherto unreported observational characteristics of the low frequency (85–35 MHz) type III–V bursts from the Sun using radio spectropolarimeter observations. The quantitative ...
  • Decameter Wavelength Observations of an Absorption Burst from the Sun and Its Association with an X2.0/3B Flare and the Onset of a ``Halo'' Coronal Mass Ejection 
    Ramesh, R; Ebenezer, E (The American Astronomical Society, 2001-09)
    We report a transient intensity reduction/absorption burst observed at decameter wavelengths in close temporal association with an X2.0/3B flare near the disk center and the onset of a ``halo'' coronal mass ejection. The ...
  • Design and Performance of a Low-Frequency Cross-Polarized Log-Periodic Dipole Antenna 
    Sasikumar Raja, K; Kathiravan, C; Ramesh, R; Rajalingam, M; Barve, Indrajit V (IOP Publishing, 2013-07)
    We report the design and performance of a cross-polarized log-periodic dipole (CLPD) antenna for observations of polarized radio emission from the solar corona at low frequencies. The measured isolation between the two ...
  • Direct estimates of the solar coronal magnetic field using contemporaneous extremeultraviolet, radio, and white-light observations 
    Anshu Kumari; Ramesh, R; Kathiravan, C; Wang, T. J; Gopalswamy, N (IOP Publishing, 2019-08-10)
    We report a solar coronal split-band type II radio burst that was observed on 2016 March 16 with the Gauribidanur Radio Spectro-Polarimeter in the frequency range ≈90–50 MHz, and the Gauribidanur RadioheliograPH at two ...
  • Dissipation scale lengths of solar wind turbulence 
    Sasikumar Raja, K; Subramanian, P; Ingale, M; Ramesh, R (IOP Publishing, 2019-02-10)
    Knowing the lengthscales at which turbulent fluctuations dissipate is key to understanding the nature of weakly compressible magnetohydrodynamic turbulence. We use radio wavelength interferometric imaging observations ...
  • 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 ...
  • Energy distribution of solar flare events 
    Sen, Samrat; Mangalam, A; Ramesh, R (Cambridge University Press, 2018-02)
    The coronal field typically reorganizes itself to attain a force-free field configuration. We have evaluated the power law index of the energy distribution f(E) = f0E−α by using a model of relaxation incorporating ...
  • The Equatorial Background Solar Corona during Solar Minimum 
    Ramesh, R; Nataraj, H. S; Kathiravan, C; Sastry, Ch. V (University of Chicago Press, 2006-09)
    We report two-frequency (51 and 77 MHz) radio observations of the equatorial brightness distribution of the “undisturbed” solar corona, close to the minimum between sunspot cycles 22 and 23. The contributions from different ...
  • An Estimate of the Coronal Magnetic Field near a Solar Coronal Mass Ejection from Low-frequency Radio Observations 
    Hariharan, K; Ramesh, R; Kishore, P; Kathiravan, C; Gopalswamy, N (IOP Publishing, 2014-11-01)
    We report ground-based, low-frequency (<100 MHz) radio imaging, spectral, and polarimeter observations of the type II radio burst associated with the solar coronal mass ejection (CME) that occurred on 2013 May 2. The ...
  • An estimate of the magnetic field strength associated with a solar coronal mass ejection from low frequency radio observations 
    Sasikumar Raja, K; Ramesh, R; Hariharan, K; Kathiravan, C; Wang, T. J (IOP Publishing, 2014-11-20)
    We report ground based, low frequency heliograph (80 MHz), spectral (85-35 MHz), and polarimeter (80 and 40 MHz) observations of drifting, non-thermal radio continuum associated with the "halo" coronal mass ejection that ...

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