Abstract
The paper deals with the observations of the fine structure of type III bursts in the 12.5–25 MHz band using the UTR-2 (IRE AN UkSSR, Kharkov) radio telescope. A fine structure arises in the form of chains of short-lived narrow-band bursts. The chains have a frequency drift analogous to type III bursts. Observations allow two different-type chains to be singled out. Ordinary stria-bursts, split-pairs and triplets belong to the first type chains. They may also involve the echo-type phenomena The second type chains (IIId) involve diffusive stria-bursts, diffusive split-pairs and triplets. The analysis of a harmonic structure of chains incidates that the first type chains are generated at the frequencies close to the local plasma electron frequency ω pe . The second type chains and, consequently, diffusive stria-bursts correspond to the second harmonic of the plasma frequency 2ω pe . Experimental data evidence that the type III bursts with a fine structure are excited by the faster particle streams than the ordinary type III bursts with a diffusive character both of the fundamental and the second harmonic.
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Baselyan, L.L., Goncharov, N.Y., Zaitsev, V.V. et al. Frequency and time splitting of decameter solar radio bursts. Sol Phys 39, 223–231 (1974). https://doi.org/10.1007/BF00154983
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DOI: https://doi.org/10.1007/BF00154983