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Two-dimensional VLA maps of solar bursts at 15 and 23 GHz with arcsec resolution
Marsh, K. A.; Hurford, G. J.
AA(California Institute of Technology, Pasadena, Calif.), AB(California Institute of Technology, Pasadena, Calif.)
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 240, Sept. 1, 1980, p. L111-L114. (ApJL Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Antenna Arrays, H Alpha Line, Microwave Emission, Solar Radio Bursts, Spatial Resolution, Microwave Antennas, Phased Arrays, Solar Flares, Very Large Array (Vla)
Bibliographic Code:


Three small, impulsive solar-microwave bursts (peak fluxes 4.9, 3.0, and 0.4 sfu) were observed during 1979 September 7-9, using the Very Large Array (VLA) at 15.05 or 22.5 GHz. The data from 10 antennas distributed on three arms of the array provide the first two-dimensional burst images with spatial resolution as high as 1.0 x 0.75 arcsec. Comparison with optical data showed in the impulsive phase of all three flares, the microwave emission was dominated by a compact source located between the H-alpha kernels. In the post-impulsive phase, the microwave source was larger and elongated in a direction consistent with the orientation of the magnetic field lines joining the H-alpha kernels. These results are interpreted to imply that the initial energy release occurs near the top of the magnetic arch joining the H-alpha kernels.

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