Physics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e..32k&link_type=abstract
Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,
Physics
Scientific paper
We have previously published dynamo models that can reproduce the flip-flop phenomenon. In this phenomenon the main part of the stellar activity changes longitude by 180 degrees. Here we use these dynamo models for studying the stellar surface differential rotation. We use standard cross-correlation methods to study the changes in the magnetic pressure maps obtained from the dynamo calculations. As these maps can be treated the same way as the temperature maps, e.g., ones obtained with the Doppler imaging, we can use the same techniques as for real observations to analyse the maps produced by the dynamo calculations. Our investigation reveals that the input rotation used in the dynamo calculations is not always obtained with the analysis. In some cases even the sign of the surface differential rotation changes from the solar type input surface rotation to anti-solar surface rotation obtained from the analysis. This means that the spot motion is not determined by the differential rotation, but mainly by the underlying magnetic field structure. There is also some indication that in some cases the strength of the surface differential rotation varies with the activity cycle. These results could have important implications for observational studies of the stellar surface differential rotation.
Elstner Detlef
Korhonen Heidi
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