Definition of the model
Human‐made dynamos are complex, multiconnected, asymmetric devices, but those operating in Nature have to function in geometrically‐simple (usually almost spherical) bodies of electrically conducting fluid, such as Earth's core. During the early development of dynamo theory, it seemed possible that no motion within such a simple “homogeneous” system could maintain a magnetic field, a feeling reenforced by some antidynamo theorems (see Antidynamo and bounding theorems and Cowling's theorem ). Whether homogeneous dynamos exist or not is an electrodynamic question, i.e., one that can be addressed without asking how the velocity V of the conductor is maintained and how a magnetic field B would affect it. It is necessary only to find a V that can sustain a nonzero B, and these are then called “kinematic dynamos”, to distinguish them from “MHD dynamos” which satisfy the full equations of magnetohydrodynamics. (See Dynamos, kinematic and Magnetohydrodynamics...
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Roberts, P.H. (2007). Dynamo, Ponomarenko. In: Gubbins, D., Herrero-Bervera, E. (eds) Encyclopedia of Geomagnetism and Paleomagnetism. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-4423-6_77
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