Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26at...22..869b&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 22, Issue 6, p.869-874
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
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.
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