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The young and magnetically active K dwarf Epsilon Eridani exhibits achromospheric activity cycle of about 3 years. Previous reconstructions of itslarge-scale magnetic field show strong variations at yearly epochs. Tounderstand how Epsilon Eridani's large-scale magnetic field geometry evolvesover its activity cycle we focus on high cadence observations spanning 5 monthsat its activity minimum. Over this timespan we reconstruct 3 maps of EpsilonEridani's large-scale magnetic field using the tomographic technique of ZeemanDoppler Imaging. The results show that at the minimum of its cycle, EpsilonEridani's large-scale field is more complex than the simple dipolar structureof the Sun and 61 Cyg A at minimum. Additionally we observe a surprisinglyrapid regeneration of a strong axisymmetric toroidal field as Epsilon Eridaniemerges from its S-index activity minimum. Our results show that all stars donot exhibit the same field geometry as the Sun and this will be an importantconstraint for the dynamo models of active solar-type stars.

monthly notices of the royal astronomical society. letters

The relation between stellar magnetic field geometry and chromospheric  activity cycles I: The highly variable field of Epsilon Eridani at activity  minimum