Abstract
The flux density spectra of cyclotron sources above the sunspotswere obtained by observations with RATAN-600 in the range of1.7–10 cm with high spectral ( \(\Delta f/f\sim 1{-}5\%\) )resolution and their spectral indices were estimated. The spectralindex was then utilized to determine the magnitude of themagnetic field at the base of the transition region on the Sun. Byanalyzing the relationship between theemisson flux density of the sources and the magnetic fieldit was found that the observed characteristics ofsunspot-associated sources did not align with predictions from asimplified radiation model commonly used for data interpretation.Specifically, there was an excess flux density in the spectrum ofordinary mode radiation compared to what was expected.
