Harmonic structure of type IIIb and III bursts

Details Harmonic structure of type IIIb and III bursts Harmonic structure of type IIIb and III bursts

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...62..145a&link_type=abstract

Solar Physics, vol. 62, May 1979, p. 145-151.

Physics

8

Decametric Waves, Harmonic Analysis, Microwave Spectra, Solar Corona, Type 3 Bursts, Frequency Shift, Octaves, Plasma Frequencies, Radio Telescopes, Solar Physics, Spectroheliographs

Scientific paper

A decameter solar radio storm of type IIIb and III bursts has been analyzed by using single-frequency records at frequencies of 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 in 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.

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