A new scattering process above solar active regions - Propagation in a fibrous medium

Details A new scattering process above solar active regions - Propagation in a fibrous medium A new scattering process above solar active regions - Propagation in a fibrous medium

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..777b&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 6, Dec. 1977, p. 777-783.

Astronomy and Astrophysics

Astrophysics

41

Electromagnetic Scattering, Plasma-Electromagnetic Interaction, Solar Activity, Solar Corona, Solar Radio Bursts, Astronomical Models, Directivity, Electron Density (Concentration), Inhomogeneity, Point Sources, Radio Transmission, Solar Magnetic Field

Scientific paper

It is shown that the measurements of number one type I burst directivity deduced from the Stereo-1 experiment are not consistent with the interpretation of many type I burst characteristics in terms of scattering by weak density inhomogeneities. A scattering model is suggested, based on the following hypotheses: (1) the radiation is generated inside a region much smaller than the observed source; (2) the medium above active regions, at altitudes where type I bursts are generated, is strongly inhomogeneous and consists of bundles of overdense fibers; (3) type I bursts are generated inside or at the border, of such bundles; and (4) the primary radiation is very directive and is beamed more or less along the fibers. It is verified that this strong scattering model accounts for most presently available space-time observations of type I bursts, including their longitude dependence.

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