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Scientific achievements, Solar system

As a result of observations of a total solar eclipse on the RATAN-600 in the microwave range we have carried out:
1) A study of the solar corona. Owing to the large effective area of the radio telescope and an absence of scattered background, high accuracy radiometry measurements of radial brightness distribution of a weak radiation behind the limb were carried out for the first time, and the data on the corona density at the distances of up to one solar radius in the range of brightness temperatures of 100 - 1 K were obtained.

2) The study of the solar northern polar region. A powerful radio source above the solar North Pole in the region of the polar coronal hole was discovered. Its contrast sharply increases toward shorter wavelengths and is dominant at the wavelengths of ~ 2.0cm. The source intensity amounts to ~1.5% of the quiet Sun. Its fine spatial structure with fluctuations at the level of 0.06% was discovered. A transition boundary from brightening to darkening at the wavelength of 3.5cm was found in the emission of the polar coronal hole. These facts are decisive for the choice of the solar cycle model.

3) Polarized radio emission of a high-latitude prominence was registered. This emission occurs at the boundary between the transition zone from the cold mass of the prominence and the surrounding corona. The magnetic field of the prominence was measured and a complex sign-alternating structure of its longitudinal component with unexpectedly high peak values (300-700F) was discovered.

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