| Dynamos |
Spherical mean-field dynamos and spherical dynamos from large-scale flows for stellar activity problems. Phenomena like active longitudes and the flip-flop phenomenon may possibly be explained by the interaction of dynamo modes. |
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| Sunspots | Variation and distribution of sunspots as manifestations of the solar dynamo over the centuries. | |
| Stability | The stability of magnetic fields in the stellar radiation zones as derived from 3D simulations of spherical shells. | |
| MRI | The magneto-rotational instability as a powerful mechanism for angular-momentum transport. |