First interferometric observations of solar microwave millisecond spike bursts

Dale E. Gary, G. J. Hurford, D. J. Flees

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

We report observations, with one-dimensional spatial resolution, of solar microwave millisecond spikes at 2.8 GHz. The observations were made with the Owens Valley frequency-agile interferometer with 20 ms time resolution. We find that the spikes occur at a position different from that of the underlying gyrosynchrotron radio burst source. All of the spikes during the rising part of the burst come from the same one-dimensional location to within ± 1", despite the fact that rapid evolution in the sense and degree of circular polarization was observed. The one-dimensional position of the spikes is consistent with a location over a large sunspot, suggesting that the emission occurs in a region of strong, converging magnetic field. The observations support the suggestion that the spikes are due to the electron-cyclotron maser mechanism.

Original languageEnglish (US)
Pages (from-to)255-259
Number of pages5
JournalAstrophysical Journal
Volume369
Issue number1
DOIs
StatePublished - Mar 1 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: corona
  • Sun: flares
  • Sun: radio radiation

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