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  • 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 Observations of a Head-Tail Radio Source 
    Vir Lal, D; Pramesh Rao, A (Astronomical Society of India, 2003)
    We have mapped the head-tail radio galaxy, 3C 129 at 240 and 610 MHz using the GMRT and studied the detailed morphology and spectral index variations in this object. This is the first attempt to observe a sample of head-tail ...
  • Low frequency radio emission from seyfert galaxies 
    Singh, V; Shastri, P; Athreya, R (Astronomical Society of the Pacific, 2009-09)
    Seyfert galaxies are low-luminosity, radio-quiet, nearby active galaxies. The high-frequency radio observations of several Seyfert galaxies show jet-like features, which tend to be confined within the host galaxy, whereas ...
  • Low Frequency Radio Emission from the 'Quiet Sun' 
    Ramesh, R (Indian Academy of Sciences, 2000-12)
    We present observations of the 'quiet' Sun close to the recent solar minimum (Cycle 22), with the Gauribidanur radioheliograph. Our main conclusion is that coronal streamers also influence the observed radio brightness ...
  • 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 ...
  • Low frequency solar radio astronomy at the Indian Institute of Astrophysics (IIA) 
    Ramesh, R (Astronomical Society of India, 2011)
    IIA is presently involved in the expansion of its existing radioheliograph operating in the frequency 120-40 MHz at the Gauribidanur radio observatory located about 80 km north of Bangalore. Once completed, the expanded ...
  • Low frequency view of GRB 190114C reveals time varying shock micro-physics 
    Misra, K; Resmi, L; Kann, D. A; Marongiu, M; Moin, A; Klose, S; Bernardi, G; de Ugarte Postigo, A; Jaiswal, V. K; Schulze, S; Perley, D. A; Ghosh, A; Dimple; Kumar, H; Gupta, R; Michałowski, M. J; Martin, S; Cockeram, A; Cherukuri, S. V; Bhalerao, V; Anderson, G. E; Pandey, S. B; Anupama, G. C; Thone, C. C; Barway, Sudhanshu; Wieringa, M. H; Fynbo, J. P. U; Habeeb, N (Oxford University Press on behalf of the Royal Astronomical Society, 2021-07)
    We present radio and optical afterglow observations of the TeV-bright long gamma-ray burst 190114C at a redshift of z = 0.425, which was detected by the Major Atmospheric Gamma Imaging Cherenkov telescope. Our observations ...
  • Low resolution spectroscopy of hot post-AGB candidates 
    Parthasarathy, M; Vijapurkar, J; Drilling, J. S (EDP Sciences, 2000-08)
    Spectral types are determined from low resolution optical spectra of 40 IRAS sources with far-infrared colours similar to planetary nebulae. The presence of circumstellar dust, high galactic latitude, and early supergiant ...
  • Low resolution spectroscopy of IRAS sources with PN like IR colours 
    Vijapurkar, J; Parthasarathy, M; Drilling, J. S (Astronomical Society of India, 1998)
  • Low resolution spectroscopy of ISOGAL sources: Search for early-type stars with infrared excess 
    Schultheis, M; Parthasarathy, M; Omont, A; Cohen, M; Ganesh, S; Sevre, F; Simon, G (E D P Sciences, 2002-05)
    An analysis of low resolution spectra and infrared data of 29 ISOGAL-DENIS sources with mid-IR excess is presented. Eight ISOGAL sources from our sample with 7-15 mu m excesses are found to be B and A-type stars, some of ...
  • Low resolution spectroscopy of selected Algol systems 
    Shanti Priya Devarapalli; Rukmini Jagirdar; Parthasarathy, M; Sahu, D. K; Mohan, V; Bhatt, B. C; Thomas, V. S (Springer, 2018-04)
    The analysis of spectroscopic data for 30 Algol-type binaries is presented. All these systems are short period Algols having primaries with spectral types B and A. Dominant spectral lines were identified for the spectra ...
  • Low-cost adaptive optics for astronomical applications 
    Chinnappan, V; Saxena, A. K; Sreenivasan, A (The International Society for Optical Engineering (SPIE), 2001-09)
    Recent advancement in the technology in integrated circuit fabrication and new smart sensors allow us to implement adaptive optics systems which is otherwise not possible to implement a few years back with limited resources ...
  • Low-cost Raspberry Pi star sensor for small satellites 
    Bharat Chandra, P; Sarpotdar, Mayuresh; Binukumar, G; Rai, Richa; Mohan, Rekhesh; Mathew, Joice; Safonova, M; Murthy, J (SPIE-Society of Photo-Optical Instrumentation Engineers, 2022-07)
    We present a low-cost Raspberry Pi-based star sensor StarberrySense using commercial-off-the-shelf components, developed and built for applications in small satellites and CubeSat-based missions. A star sensor is one of ...
  • Low-degree high-frequency p and g modes in the solar core 
    Mathur, S; García, R. A; Eff-Darwich, A (Springer, 2010)
    Solar gravity (g) modes propagate within the radiative part of the solar interior and are highly sensitive to the physical conditions of the solar core. They would represent the best tool to infer the structure and the ...
  • 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 Observations of Drifting, Non-Thermal Continuum Radio Emission Associated With the Solar Coronal Mass Ejections 
    Ramesh, R; Kishore, P; Mulay, S. M; Barve, Indrajit V; Kathiravan, C; Wang, T. J (IOP Publishing, 2013-11-20)
    Low-frequency (80 MHz) imaging and spectral (≈85-20 MHz) observations of moving type IV radio bursts associated with coronal mass ejections (CMEs) from the Sun on three different days are reported. The estimated drift speed ...
  • Low-frequency Observations of Polarized Emission from Long-lived Non-thermal Radio Sources in the Solar Corona 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A (IOP Publishing, 2011-06-10)
    We report observations of circularly polarized emission from the solar corona at 77 MHz during the periods 2006 August 11-18, 2006 August 23-29, and 2007 May 16-22 in the minimum phase between the sunspot cycles 23 and 24. ...
  • Low-frequency Observations of Transient Quasi-periodic Radio Emission from the Solar Atmosphere 
    Sasikumar Raja, K; Ramesh, R (IOP Publishing, 2013-09-20)
    We report low-frequency observations of quasi-periodic, circularly polarized, harmonic type III radio bursts whose associated sunspot active regions were located close to the solar limb. The measured periodicity of the ...
  • Low-frequency quasi-periodic oscillations and shocks in accretion on to black hole 
    Singh, Chandra B; Mondal, Santanu; Garofalo, David (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    Low-frequency quasi-periodic oscillations (LFQPOs) have been routinely observed in black hole X-ray binaries (BHXRBs). These LFQPOs can be explained by axisymmetric shock oscillation in accretion flow around a rotating ...

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