VLA observations of solar active regions. I - The slowly varying component

Details VLA observations of solar active regions. I - The slowly varying component VLA observations of solar active regions. I - The slowly varying component

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..325f&link_type=abstract

Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 325-347. Research supported by the Consiglio Nazionale delle Richerch

Mathematics

Logic

50

Circular Polarization, Radio Interferometers, Solar Flares, Solar Magnetic Field, Solar Radiation, Solar Radio Bursts, Astronomical Maps, H Alpha Line, Solar Radio Emission, Solar Wind, Solar X-Rays, Very Large Array (Vla)

Scientific paper

In the considered investigation, it is argued that the substantial part of the radio flux from solar active regions at 6 cm wavelength is actually due to bremsstrahlung from plage-associated sources. A two-component model is needed in which only the sunspot-associated component is due to gyroresonant processes. Such a two-component model has been previously suggested by Pallavicini et al. (1979, 1980) on the basis of a comparison of 2.8 cm and X-ray observations. Very Large Array (VLA) synthesis maps of the active region AR 2032 at 6 cm wavelength are presented. The maps are compared with H-alpha photographs and magnetograms of the same region. The synthesis maps indicate that the radio emission is dominated by a small (approximately 30 seconds), bright (approximately 1 million K), circularly polarized (approximately 30%) source whose morphological features are correlated with the chromospheric plage seen as bright regions on the H-alpha photographs. A description is presented of radio wavelength observations of bursts which are composed of elementary events whose temporal evolution is very similar to that detected at hard X-ray wavelengths.

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