Thermal radio emission of solar active regions derived from quantitative analysis of SKYLAB X-ray pictures and compared with observation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Bremsstrahlung, Radio Emission, Solar Activity, Temperature Distribution, Thermal Mapping, X Ray Imagery, Brightness Temperature, Data Reduction, Skylab Program, Spectroheliographs, X Ray Astronomy

Scientific paper

Using X-ray pictures of the sun taken by the Aerospace/Marshall Space Flight Center experiment during the Skylab mission in August 1973, distributions of temperature T and differential emission measure E of hot coronal active regions are calculated. From T and E, the thermal radio emission of these active regions at 2.8 cm wavelength is determined and then compared with radio maps of the sun that were scanned on the same days with the Effelsberg radio dish. Indications are found that the radio emission is not totally thermal bremsstrahlung and that there is an additional contribution of magnetic bremsstrahlung.

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