Radio images of the sun in the cm-wavelength range

Astronomy and Astrophysics – Astronomy

Scientific paper

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Radiation Distribution, Radio Astronomy, Solar Atmosphere, Solar Radio Emission, Astronomical Models, Chromosphere, Circular Polarization, Solar Corona

Scientific paper

According to theoretical concepts concerning the solar atmosphere related to an abrupt increase in temperature in the transition area between chromosphere and corona, the sun should have a bright boundary in radio pictures based on radiation in the wavelength range from 1 to 6 cm. A 100-m telescope with high resolution was used for a study of the radiation distribution on the solar disk for the wavelength range from 1.2 to 6 cm. Pictures showing a surprising amount of structural detail on the solar disk were obtained. The observations demonstrated, however, that the expected enhanced brightness of the solar disk boundary compared to the interior does not exist. The implications of the observational results for the theoretical solar models are discussed.

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