On the nature of some active regions in the microwave range

Details On the nature of some active regions in the microwave range On the nature of some active regions in the microwave range

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...42..377f&link_type=abstract

Solar Physics, vol. 42, June 1975, p. 377-390.

Physics

15

Brightness Temperature, Microwave Emission, Solar Radio Emission, Angular Resolution, Bremsstrahlung, Gyrofrequency, Halos, Interferometry, Magnetic Fields, Polarization (Waves), Temperature Distribution, Thermal Emission

Scientific paper

The radio emission of a selected number of solar active regions has been investigated with high angular resolution at two frequencies: 10 and 17 GHz. By comparing the results of the two observations, the following conclusions can be drawn: (1) The brightness temperature distribution of an active region is often composed of very bright cores of small dimension (angular extent theta equals about 20 seconds of arc) imbedded in extended halos of lower brightness. (2) The radio emission of such structures as well as the degree of polarization can be explained with a thermal process. The halos can originate by pure thermal bremsstrahlung while in the case of the very bright cores found at 10 GHz (brightness temperature Tb equals about 1-9 million K) the emission at the harmonics of the gyrofrequency is needed.

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