ABSTRACT
Dynamos on an impressive range of scales have been addressed in this book ranging from the experimental scale of a few meters to galactic discs, i.e. some 1020 m. Even if one restricts attention to natural dynamos, the Earth’s core or the Sun would constitute objects on the nano, or even a pico, scale when measured in Galactic units! As we have seen in this book, it is quite remarkable that a common formalism (and similar physical processes) governs the dynamics of dynamos on such a wide disparity of scales. Not only do the same governing equations (of course, under different parameter regimes) apply to these objects, but the same magnetic field generating instability appears to develop; albeit in the “slow dynamo” regime for the small planetary systems, and in “fast dynamo” regime for larger objects. This ability of the dynamo instability to develop in such a large variety of natural bodies is probably its most striking property.
