VLA observations of impulsive solar flares at 4.9 GHz

Details VLA observations of impulsive solar flares at 4.9 GHz VLA observations of impulsive solar flares at 4.9 GHz

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..352m&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 352-358.

Astronomy and Astrophysics

Astrophysics

24

Microwave Emission, Solar Flares, Solar Radio Bursts, Superhigh Frequencies, Astronomical Maps, H Alpha Line, Magnetic Field Configurations, Magnetic Signatures, Solar Arrays

Scientific paper

A series of snapshot synthesis maps constructed as a function of time provided a complete mapping of source structure in one dimension and absolute location in two dimensions of five impulsive solar microwave bursts observed during July 15-18, 1978. It was found that all five flares were dominated by a single 12-18 arcsec source located between the H-alpha kernels, near the magnetic neutral line. Spectral data from Sagamore Hill (1.4-35 GHz) show that the spectral turnover at low frequencies results from the absorption by the ambient active region; these results, together with the observed magnetic configuration, suggest a model which could explain the evolution in source structure at 4.9 GHz in terms of magnetic reconnection which starts below the optical depth of the ambient active region equal to 1.

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