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Harmonic structure of type IIIb and III bursts

โœ Scribed by E. P. Abranin; L. L. Baselyan; N. Yu. Goncharov; V. A. Zinichev; V. O. Rapoport; Ya. G. Tsybko

Publisher
Springer
Year
1979
Tongue
English
Weight
349 KB
Volume
62
Category
Article
ISSN
0038-0938

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โœฆ Synopsis

A decameter solar radio storm of type IIIb and III bursts has been analysed, using single frequency records at frequencies 12.5 and 25.0 MHz.

Several kinds of burst associations are classified. As a result it is shown that in double oblique burst-traces of type IIIb +III on the frequency-time plane the type III burst is shifted by an octave above the type IIIb burst at any moment of the IIIb +III pair's lifetime. In particular, the harmonic structure of the spectrum is peculiar to the event of type IIIb +III in the initial and the final stages. This property of the pair is clear if the type IIIb and III radiations occur at the fundamental coronal plasma frequency and its harmonic respectively. On the other hand, if it is assumed that a type IIIb burst is the precursor of a type III one, there is no reason why the two bursts should be harmonically related.

๐Ÿ“œ SIMILAR VOLUMES

Harmonic relation of type IIIb-III solar
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โœ E. P. Abranin; L. L. Bazelyan; Ya. G. Tsybko ๐Ÿ“‚ Article ๐Ÿ“… 1984 ๐Ÿ› Springer ๐ŸŒ English โš– 259 KB

This study of type IIIb-III events strongly supports their interpretation as fundamental-harmonic burst pairs. Type IIIb chains and the related type III bursts drift from 12.5 to 6.25 MHz and from 25.0 to 12.5 MHz, respectively, during similar time intervals of 11.1 and 11.0 s, on the average. This

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## Discussion D. Smith: I know spontaneous emission maximizes at about 90 ~ However, if B is present, amplification maximizes at about 0 ~ with respect to B. Rosenberg: No. D. Smith: According to Yip the growth rate maximizes along the magnetic field. Rosenberg" Direction of B does not make that