Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..137g&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
We present multi-wavelength observations of an active region in the range of 1.7 to 30 cm obtained with the RATAN-600 radio telescope with high polarization accuracy (up to 0.5%). The active region was observed on six consecutive days in May 96. At short wavelengths the circular polarization scans show a bipolar structure in conformity with the bipolar magnetic field. However at 14.5 cm the circular polarization drops practically to zero and at longer wavelengths the sense of the polarization is reversed in {both components}. This was consistently observed through all our six days of observation while the region was moving from the center of the disk to the west limb. This unusual polarization inversion cannot be interpreted in terms of the well-known propagation effects under conditions of weak and strong coupling.
Alissandrakis Constantine
Bogod Vladimir
Garaimov V.
Gizani Nectaria A. B.
Zheleznyakov Vladimir V.
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