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Preferred term

dynamo theory  

Definition

  • In physics, the dynamo theory proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field. The dynamo theory describes the process through which a rotating, convecting, and electrically conducting fluid can maintain a magnetic field over astronomical time scales. A dynamo is thought to be the source of the Earth's magnetic field and the magnetic fields of Mercury and the Jovian planets. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Dynamo_theory)

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http://data.loterre.fr/ark:/67375/MDL-FSTJXGM6-5

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