Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pazh...15.1039t&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 15, Nov. 1989, p. 1039-1043. In Russian. In Russian.
Astronomy and Astrophysics
Astronomy
Frequency Distribution, Plasma Oscillations, Type 3 Bursts, Harmonic Oscillation, Solar Corona, Temporal Distribution
Scientific paper
Averaged data on type III solar radio bursts at fixed frequencies in the 12.5-25 MHz range and beyond are examined, showing that there are two branches of the burst duration dependence on frequency. This splitting is used to distinguish between bursts occurring at the fundamental and the second harmonics of the plasma frequency. Type IIIb radiation is characterized by a diagram of the mean duration vs frequency of the stria bursts at the fundamental harmonic. Type III bursts at meter and decameter wavelengths are compared, showing a change in the behavior of the duration frequency dependence. It is suggested that this change may be associated with the initial acceleration and the subsequent expansion of the source along its path in the lower and intermediate corona.
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