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

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Abstract

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 (∼ 60 %), had an extension as large as 17′ (7.5 × 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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Author notes

  1. Keizo Kai

    Present address: Division of Radiophysics, CSIRO, P.O. Box 76, 2121, Epping, N.S.W., Australia

Authors and Affiliations

  1. Tokyo Astronomical Observatory, University of Tokyo, Mitaka, Tokyo, Japan

    Keizo Kai

  2. Dept. of Astronomy, University of Tokyo, Tokyo, Japan

    Akio Takayanagi

Authors
  1. Keizo Kai
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  2. Akio Takayanagi
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Kai, K., Takayanagi, A. Interferometer observation of pulsating sources associated with a type IV solar radio burst. Sol Phys 29, 461–475 (1973). https://doi.org/10.1007/BF00150826

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  • DOI: https://doi.org/10.1007/BF00150826

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