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Recent spectro-polarimetric observations of solar-type stars have shown thepresence of photospheric magnetic fields with a predominant toroidal component.If the external field is assumed to be current-free it is impossible to explainthese observations within the framework of standard mean-field dynamo theory.In this work it will be shown that if the coronal field of these stars isassumed to be harmonic, the underlying stellar dynamo mechanism can supportphotospheric magnetic fields with a prominent toroidal component even in thepresence of axisymmetric magnetic topologies. In particular it is argued thatthe observed increase in the toroidal energy in low mass fast rotating starscan be naturally explained with an underlying $\alpha\Omega$ mechanism.

Stellar dynamo models with prominent surface toroidal fields