Peculiarities of polarized radio emission of solar active regions

Details Peculiarities of polarized radio emission of solar active regions Peculiarities of polarized radio emission of solar active regions

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011arep...55...82y&link_type=abstract

Astronomy Reports, Volume 55, Issue 1, pp.82-90

Astronomy and Astrophysics

Astronomy

2

Scientific paper

Spectra of solar-flare active regions displaying peculiarities in their polarized radio emission observed on the RATAN-600 radio telescope at 2-16 GHz are considered. An appreciable dip of the circularly polarized emission (Stokes parameter V) in the middle of the microwave range (6-12 GHz), sometimes with a reversal of the sign of the polarization, is unusual. In some cases, the ordinary emission also dominates at long microwave wavelengths. Expected peculiarities of the frequency structure of microwave sources are calculated in simple models with loops in the form of hot and cool tori. Numerical calculations of these spectra show that the above features of the polarized emission can be explained by the presence of a hot region in the solar corona. It is shown that the parameters of the spectrum of the polarized emission can be used to determine the magnetic field in this hot region and the product of the relative magnetic-field gradient and the loop thickness.

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