7 Beyond Rotation

Most of our knowledge about the occurrence and strength of magnetic fields in cool stars can be explained by a close relation between rotation and magnetic field generation. While geometries are more difficult to interpret – partly because the observational picture is not unambiguous – the general idea of the rotation-induced dynamo seems to be valid over a rather large scale of physical objects with outer convection zones. There are a few topics beyond this relation between rotation and field generation that should be discussed briefly in this section.

 7.1 A scaling law for saturated planetary and stellar dynamos
 7.2 Brown dwarfs
 7.3 Fossil or dynamo fields in young low-mass stars

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