High-resolution observations of solar radio bursts at 2, 6, and 20 CM wavelength

Details High-resolution observations of solar radio bursts at 2, 6, and 20 CM wavelength High-resolution observations of solar radio bursts at 2, 6, and 20 CM wavelength

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...83..285w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 83, March 1983, p. 285-303.

Physics

22

Coronal Loops, High Resolution, Plasma Heating, Radio Telescopes, Solar Corona, Solar Radio Bursts, Antenna Arrays, Brightness Temperature, Circular Polarization, H Alpha Line, Magnetic Flux, Microwave Emission, Very Large Array (Vla)

Scientific paper

Synthesis maps of eight solar bursts are constructed at 2, 6, and 20 cm wavelength with second-of-arc angular resolution using observations obtained by the Very Large Array and the Westerbork Synthesis Radio Telescope. The impulsive phase of the radio bursts is found to be located near the magnetic neutral line of the active regions, and between the flaring H-alpha kernels which mark the footpoint of magnetic loops. The impulsive phase of one 6 cm burst was determined to be smaller and spatially separated from both the preburst radio emission and the gradual decay phase of the burst, while another 6 cm burst exhibited preburst heating of the coronal loop in which the burst occurred. It is suggested that the plasma was heated at a lower level in the loop, while the burst energy was released several minutes later at a higher level. The rapid changes in circular polarization exhibited by a multiple-spike 20 cm burst can be attributed to either a magnetically complex region or the emission of new magnetic flux at coronal heights where magnetic field strengths were approximately equal to 300-400 G.

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