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Browsing by Author "Thejappa, G"

Browsing by Author "Thejappa, G"

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  • Estimation of coronal magnetic fields using Type-I emission 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V; Tlamicha, A (Czechoslovakia Academy of Sciences, 1986-03)
    The radial dependence of the coronal magnetic field above active regions is calculated using Type-I chain data existing in the literature. Assuming that Type-I emission is due to shock waves, the upstream shock velocity ...
  • Fast electron generation in quasiperpendicular shocks and type II solar radiobursts 
    Krasnoselskikh, V. V; Kruchina, E. N; Volokitin, A. S; Thejappa, G (European Southern Observatory, 1985-08)
    The paper is devoted to the theory of type II solar radio bursts caused by collisionless shock waves propagating in the coronal plasma. The model developed is based on the theory of collisionless shock waves, which predicts ...
  • Fine structure in solar decametric radiation 
    Thejappa, G; Sastry, Ch. V; Gopalswamy, N (Harwood Academic Publishers, 1984)
    Observations and interpretations of some of the fine structure in decametric solar radio emission -such as (1) the time structure of type III bursts, (2) absorption bursts, and (3) slowly drifting spikes -are presented. ...
  • Ion-sound turbulence due to shock gradients in collisionless plasmas 
    Gopalswamy, N; Thejappa, G (Indian Academy of Sciences, 1985-11)
    The dispersion relation for ion sound waves generated in a perpendicular shock is derived and the energy density of ion-sound turbulence is obtained using quasilinear theory. The result is compared with the lower hybrid ...
  • A Model of the Generation Mechanism of Type II Solar Radio Bursts 
    Thejappa, G (Indian Institute of Astrophysics, Bangalore, 1986)
    The proposed model for the generation mechanism of type II solar radio bursts is based on the fact that a small fraction of ions is reflected from the shock front and tend to evolve into a 'ring' in the downstream region ...
  • Observations and interpretation of solar decametric absorption bursts 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V (Indian Academy of Sciences, 1983-09)
    The observations of intensity reductions or absorption bursts in the solar decametric radio-continuum are reported. The reductions are interpreted as the absorption of continuum radiation by a shock-generated ion sound ...
  • Observations on the Fine Structures in Solar Decametric Radio Emission 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V (Indian Institute of Astrophysics, Bangalore, 1984)
    The Solar decametric radio emission consists of a variety of fine structures. This reflects the complexity of the corona at this level. Two observations, viz. absorption bursts and short duration narrow band bursts are ...
  • On type II solar radio bursts 
    Thejappa, G (Elsevier, 1986)
    The proposed model for the generation mechanism of type II solar radio bursts is based on the fact that a small fraction of ions is reflected from the supercritical shock front and tend to evolve into a 'ring' in the ...
  • The Radio Bursts from the Outer Corona 
    Thejappa, G (Indian Institute of Astrophysics, Bangalore, 1988)
  • 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 ...
  • Supernova Shock 
    Thejappa, G (Indian Institute of Astrophysics, 1988)
    A Violent shock is formed at the site of the collision of inner and outer cores of a collasping star and the supernova explosion is born. Here we briefly review the evolution of the shock from its birth until its death.
  • Time structure of solar decametre Type III radio bursts 
    Thejappa, G; Sastry, Ch. V (Indian Academy of Sciences, 1982-06)
    The time structure of solar radio decameter Type III bursts occurring during the periods of enhanced emission is investigated. It is found that the time profiles can take a variety of forms of which three distinct types ...
  • Type II burst high time resolution and polarization characteristics at frequencies higher than 200 MHz 
    Zlobec, P; Thejappa, G (Hvar Observatory Bulletin, 1987)
    Some new results based on high time resolution and polarization studies of solar type II radio bursts are presented. It is found that the fine structures are present in some events whereas they are completely absent in few ...
  • Type II solar radio emission - A self-consistent approach 
    Thejappa, G (Kluwer Academic Publishers, 1987-03)
    An attempt is made to construct a self-consistent model for type II radio bursts. It is proposed that a majority of the type II shocks are super-critical and the reflected ions from such type II shock fronts are described ...

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