High resolution intensity and polarization structure of the sun at 21 CM

Details High resolution intensity and polarization structure of the sun at 21 CM High resolution intensity and polarization structure of the sun at 21 CM

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61...79c&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 1, Oct. 1977, p. 79-91.

Astronomy and Astrophysics

Astrophysics

23

Brightness Temperature, Circular Polarization, Luminous Intensity, Solar Radio Emission, Astronomical Maps, Astronomical Photography, Halos, High Resolution, Optical Thickness, Radio Telescopes

Scientific paper

The sun has been observed at 21 cm with the Westerbork Synthesis Radio Telescope with a resolution of 21 by 61 arcsec. The maps of total intensity and circular polarization are presented. The most prominent structures are three active centers. The radio parameters derived are compared with optical and magnetic data. For one region it is also possible to combine the 21-cm data with observations at 2.8 cm obtained with a resolution of 17 by 60 arcsec. At 21 cm the active centers are very extended with no prominent peaks. The region observed also at 2.8 cm presents at this frequency a bright core of smaller size surrounded by a lower-intensity halo. This difference is interpreted in terms of an optical-thickness effect. The brightness temperatures at 21 cm are of the order of 1 to 2 million K, and the circularly polarized emission, well-correlated with the magnetic structure, has an intensity never greater than 5% of the total intensity.

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