IIA Institutional Repository

Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

Sort by: Order: Results:

  • A radio continuum and H I study of optically selected blue compact dwarf galaxies: Mrk 1039 and Mrk 0104 
    Ramya, S; Kantharia, N. G; Prabhu, T. P (Astronomical Society of the Pacific, 2009-09)
    We present a GMRT radio continuum and H I study of two Blue Compact Dwarf (BCD) galaxies Mrk 1039 and Mrk 0104. GMRT 610 MHz observations of Mrk 1039 show that the emission is coincident with a bright intense star forming ...
  • Radio emission by parallel acceleration mechanism 
    Krishan, V; Sivaram, C (Springer, 1983-04)
    The equations describing the linear-acceleration mechanism of radiation emission are generalized and applied to type III and IIIb solar radio bursts. A general expression for the power emitted by an electron in a spatially ...
  • Radio emission by particles due to pulsar spin 
    Thomas, R. M. C; Gangadhara, R. T (EDP Sciences, 2005-07)
    We present a relativistic model for the motion of charged particles in rotating magnetic field lines projected onto a plane perpendicular to the rotation axis. By making an approximation that the projected field lines are ...
  • Radio emission from a helical electron beam-plasma system in a twisted magnetic field 
    Krishan, V (Institute of Physics, 1982-01)
    The excitation of electromagnetic radiation near the harmonics of electron plasma frequency from a helical electron beam travelling parallel to a helical magnetic field through a stationary inhomogeneous plasma is studied. ...
  • Radio emission from an intense electromagnetic beam-plasma system 
    Krishan, V (D. Reidel Publishing Co., 1979-06)
    Interaction of a high-intensity and low-frequency electromagnetic beam with a plasma is investigated. The dynamics of plasma particles under this strong electromagnetic field is calculated without using the perturbation ...
  • Radio emission from pulsars due to relativistic plasma 
    Roy, Tridib; Gangadhara, R. T. (IOP Publishing, 2019-07)
    Pulsar radio emission is not well understood because of a lack of knowledge about the emission geometry and the plasma process involved. We develop a mechanism for pulsar radio emission that takes into account the ...
  • Radio Emission From The Quiet Sun and Active Regions at Decametric Wavelengths 
    Sastry, Ch. V (Indian Institute of Astrophysics, Bangalore, 1986)
    The Continuum emission from the Quiet Sun and active regions is the radiation from the solar atmosphere when there is no transient burst activity. At decametric wavelengths this radiation originates in the outer corona. A ...
  • Radio emission from the Solar Corona due to shock waves 
    Thejappa, G (Indian Institute of Astrophysics, Bangalore, 1988)
    The slowly drifting solar type II radio bursts are believed to be due to the flare associated shock waves propagating radially outward in the corona. The main observational characteristics of these bursts show that the ...
  • Radio emission of coronal shock waves 
    Benz, A. O; Thejappa, G (European Southern Observatory, 1988-08)
    The "backbone" emission of shock initiated coronal (metric) type II solar radio bursts is considered. The source has extremely narrow bandwidth and appears to be stationary in relation to the shock. The increasingly complete ...
  • Radio Emission Processes: Part I 
    Subramanian, K. R (Springer, 2010)
    This chapter provides an overview of the radio emission mechanisms in the Solar atmosphere. Incoherent (free - free emission and gyro - emission) and coherent (plasma emission and electron cyclotron maser emission) emission ...
  • Radio Evolution of a Type IIb Supernova SN 2016gkg 
    Nayana, A. J; Chandra, Poonam; Krishna, Anoop; Anupama, G. C (American Astronomical Society, 2022-08-01)
    We present extensive radio monitoring of a Type IIb supernova (SN IIb), SN 2016gkg during t ∼ 8−1429 days postexplosion at frequencies ν ∼ 0.33−25 GHz. The detailed radio light curves and spectra are broadly consistent with ...
  • Radio frequency emission in electron beam-plasma and beam-beam interaction 
    Krishan, V; Sinha, K. P; Krishan, S (D.Reidel Publishing Co.,, 1978-01)
    A linear excitation of electromagnetic modes at frequencies ~_ (n+1/2)ωce , in a plasma through which two electron beams are contra-streaming along the magnetic field is investigated. This may be a source of the observed ...
  • 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 noise-bursts from solar M-regions 
    Das, A. K; Bhargava, B. N (Nature Publishing Group, 1953-11)
    In 1932, Bartels put forward the hypothesis that moderate geomagnetic storms with gradual commencements were associated with certain active regions on the sun which he called M-regions. Solar and geomagnetic studies in ...
  • 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 a nearby type IIP SN 2012aw 
    Yadav, N; Ray, A; Chakraborti, S; Stockdale, C; Chandra, P; Smith, R; Roy, R; Dwarkadas, V; Sutaria, F. K; Pooley, D; Kumar, B; Bose, S (Cambridge University Press, 2014-01)
    SN 2012AW is a type-IIP supernova which exploded in M95. In this paper we discuss the radio observations of this supernova and model them to determine the important parameters relevant to the explosion and the evolution ...
  • 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 S0 galaxy NGC 1218 (3C 78) 
    Saikia, D. J; Subrahmanya, C. R; Patnaik, A. R; Unger, S. W; Cornwell, T. J; Graham, D. A; Prabhu, T. P (Royal Astronomical Society, 1986-04)
    The authors present VLA observations of the S0 galaxy NGC 1218 at λ20 and 6 cm with both the A and D arrays, at λ20 cm with the B array and at λ2 and 1.3 cm with the A array. They also present VLBI observations at λ6 cm ...
  • 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 ...

Search DSpace


Browse

My Account