On the asymmetry of the solar bipolar active regions from the phenomenon of the sign change of the microwave circular polarized emission

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Using one-dimensional scans of the polarization distribution of the microwave emission in solar active regions, as obtained at the Siberian Solar Radio Telescope it is shown that the phenomenon of sign inversion of the circular polarization of the microwave emission at a wavelength of 5.2 cm from bipolar groups has a west asymmetry when the group passes the central meridian (CM) of the Sun. This probably means that the axis of the symmetry of the magnetic field for a typical bipolar group is inclined to the east limb of the Sun so that the following wing of each loop is more inclined with respect to the horizontal than the preceding wing. Analysis of 77 active regions showed that this phenomenon had a tendency to be symmetrical relative to the CM or to have an east asymmetry under an increasing level of X-ray activity.

Keywords: Circular polarization of the microwave emission; Solar active region; Symmetry

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/1055679031000136418

Affiliations: Nizhny Novgorod Planetarium Pohvalinsky S'ezd 5 Nizny Novgorod Russia 603001

Publication date: December 1, 2003

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