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Dynamo theory

This article is about a proposed theory for the source of a planet's magnetic field. For an explanation of the operation of a mechanical dynamo, see Dynamo.
Illustration of the dynamo mechanism that generates the Earth's magnetic field: convection currents of fluid metal in the Earth's outer core, driven by heat flow from the inner core, organized into rolls by the Coriolis force, generate circulating electric currents, which supports the magnetic field.[1]

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.

  1. ^ "How does the Earth's core generate a magnetic field?". USGS FAQs. United States Geological Survey. Archived from the original on 18 January 2015. Retrieved 21 October 2013.
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