Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...39..193m&link_type=abstract
Solar Physics, vol. 39, Nov. 1974, p. 193-206.
Astronomy and Astrophysics
Astronomy
24
Position (Location), Radio Astronomy, Solar Radio Bursts, Type 3 Bursts, Vertical Distribution, Density Distribution, Harmonic Excitation, Microwave Emission, Plasma Frequencies, Short Wave Radiation, Solar Corona
Scientific paper
Observations of type III radio bursts at 169 MHz with high resolution in space, time, and frequency are presented. Average height above the photosphere is obtained and discussed in terms of (1) shift of the burst position from the radial positions, (2) scattering of the radiation on coronal inhomogeneities, (3) true dispersion in height of the regions where 169-MHz type III bursts originate, and (4) emission at the fundamental or the harmonic of the local plasma frequency and the occurrence of fundamental-harmonic pairs. Arguments for emission at the fundamental or harmonic plasma level are weighed, with most arguments favoring the conclusion that type III bursts are generally emitted at the harmonic of the plasma frequency.
Mercier Claude
Rosenberg Harold
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