Abstract
Using observations with a high angular resolution of ∼1″, we reveal a cyclotron radiation source with a ring-shaped structure of the image. The source is located in the solar corona above the main spot of the NOAA 11140 active region. Observations were carried out during the solar eclipse of January 4, 2011, using two RT-32 radio telescopes that operated at wavelengths of 3.5, 6.2, and 13 cm and registered Stokes parameters I and V. The features of the structure are interpreted within the known theory of the cyclotron radio radiation of hot coronal plasma (2–4 MK) in the presence of the strong magnetic field of the sunspot (∼3 kG).
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