Non-Axisymmetric Magnetic Fields and Flip-Flops on the Sun and Cool Stars |
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Authors: | S V Berdyugina |
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Institution: | (1) Institute of Astronomy, ETH Zentrum, 8092 Zurich, Switzerland;(2) Astronomy Division, University of Oulu, P.O. Box 3000, 90014, Finland |
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Abstract: | The modulation of solar activity closely follows the solar rotation period suggesting the existence of long-lived active regions
at preferred longitudes. For instance, two preferred active longitudes in both southern and northern hemispheres are found
to be persistent at the century time scale. These regions migrate with differential rotation and periodically alternate their
activity levels showing a flip-flop cycle. The pattern and behaviour of active longitudes on the Sun is similar to that on
cool, rapidly rotating stars with outer convective envelopes. This suggests that the magnetic dynamo, including non-axisymmetric
magnetic fields and flip-flop cycles, is also similar in these stars. This allows us to overview the phenomenon of stellar
magnetic activity and to study it in detail on the Sun. |
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