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Interferometer observation of pulsating sources associated with a type IV solar radio burst

✍ Scribed by Keizo Kai; Akio Takayanagi

Publisher
Springer
Year
1973
Tongue
English
Weight
995 KB
Volume
29
Category
Article
ISSN
0038-0938

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✦ Synopsis

An extremely complex outburst, part of which showed unsually rapid intensity fluctuations of a few second interval, was observed on 1970 November 5 with the 160 MHz interferometer of the Nobeyama Solar Radio Station. The pulsating source, which was stable in position and strongly circularly polarized (c,~60 %), had an extension as large as 17'(7.5 β€’ 105 km) in the east-west direction. The structure of the source remained unchanged while the source darkened and brightened repeatedly. The change of the source brightness occurred in a time shorter than a second.

Two alternative mechanisms responsible for the pulsating phenomenon are suggested; (1) gyroresonance absorption of continuum radiation by a fast particle beam injected in a quasi-periodic manner into a large region of weak magnetic field, or (2) magnetohydrodynamic oscillation of the continuum source itself, which is intrinsically much smaller than observed. It is observed as a large source as a consequence of scattering of the emitted radiation in a region situated above the source.

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