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Title:
First interferometric observations of solar microwave millisecond spike bursts
Authors:
Gary, Dale E.; Hurford, G. J.; Flees, D. J.
Affiliation:
AA(California Institute of Technology, Pasadena), AB(California Institute of Technology, Pasadena), AC(California Institute of Technology, Pasadena)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 1, 1991, p. 255-259. (ApJ Homepage)
Publication Date:
03/1991
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Interferometry, Microwave Emission, Solar Corona, Solar Flares, Solar Radio Bursts, Circular Polarization, Solar Magnetic Field, Spatial Resolution, Sunspots
DOI:
10.1086/169756
Bibliographic Code:
1991ApJ...369..255G

Abstract

Observations, with one-dimensional spatial resolution, of solar microwave millisecond spikes at 2.8 GHz are reported. The observations were made with the Owens Valley frequency-agile interferometer with 20 ms time resolution. It is found 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 + or - 1 arcsec, 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.

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