Sign reversals of the polarization of the microwave emission of sunspot radio sources |
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| Authors: | T I Kal’tman A N Korzhavin Yu T Tsap |
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| Institution: | (1) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkesskaya Republic, 357169, Russia;(2) Crimean Astrophysical Observatory, National Academy of Sciences of Ukraine, Nauchnyi, Crimea, 98409, Ukraine |
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| Abstract: | Thermal cyclotron emission features from a sunspot-associated source in a solar active region are considered in the framework of a three-level temperature model with a hot layer. The images of the source have a complex fine structure, with rings with different brightness temperatures and different signs of circular polarization. The proposed model suggests the possibility of a double or multiple reversal of the sign of polarization, as well as a significant increase of the fluxes in the 3–4 cm range, as is typical of active regions associated with proton flares. Energetic particles of the halo cannot provide the required temperatures of the layers. Alternative heating mechanisms are discussed. |
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