Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..131b&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 131-138.
Astronomy and Astrophysics
Astrophysics
6
Radiation Distribution, Solar Radio Bursts, Astronomical Models, Circular Polarization, Depolarization, Electromagnetic Scattering, Solar Limb
Scientific paper
The concept of type I sources derived from observations of type I bursts with high-resolution radioheliographs is reviewed. The type I active region is reduced to a limited number of sources which emit homologous bursts. Using this concept and data from a multilobe radioheliograph, it is shown that the duration of individual type I bursts tends to increase for sources near the limbs, while no center limb effect is found for the diameters. This is probably a propagation effect which produces moving type I bursts and depolarization (of a primary polarized source). Moreover, a situation favorable for the observation of moving type I bursts seems to be when the line of sight makes a large enough angle to the magnetic field at the source level. These observational results are in good agreement with the theory of type I bursts of Mangeney and Veltri (1976) as well as with the scattering model proposed by Bougeret and Steinberg (1977).
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