Sign reversals of the polarization of the microwave emission of sunspot radio sources

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 s...

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Bibliographic Details
Published in:Astronomy reports 2005-09, Vol.49 (9), p.747-754
Main Authors: Kal'tman, T I, Korzhavin, A N, Tsap, Yu T
Format: Article
Language:English
Subjects:
Emissions
Polarization
Radio astronomy
Solar physics
Sunspots
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Summary: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.
ISSN:1063-7729
1562-6881
DOI:10.1134/1.2045325