Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..143b&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
Observations indicated that the helicity sign of active regions is predominantly negative in the northern hemisphere and positive in the southern. From some references we find that the hemispheric rule of αbest does not change with a new cycle but the parameter Hc shows a weak opposite preference for Huairou data in the cycle 23 and no preference for Mees data. How to explain such a phenomenon? We think one reason may be from Faraday rotation. Faraday rotation will produces a counterclockwise rotation of the azimuth for a line-of-sight field of positive polarity. In the cycle 23 the polarity of leading sunspots is positive in the northern hemisphere and then some active regions with negative helicity may reverse their original twist handedness and show positive helicity. Hc is more susceptible to Faraday rotation than αbest because it is mainly related to the areas where the line-of-sight field is strong. Therefore if Faraday rotation is not removed in our observations the hemispheric rule showed is weak in the cycle 23 than in the cycle 22 (for αbest) even opposite (for Hc).
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