http://astro-tom.com/advanced/advanced_dictionary.htm WebThe dynamo effect is when a rotating electric current creates a magnetic field. The flowing molten metal in Earth's core generates an electric current. And since the Earth is …
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Dynamo theory - Wikipedia
WebDynamical time for barycentric phenomena which replaced ephemeris time when the IAU 1976 System of Astronomical Constants was implemented in the Astronomical Almanac in 1984.. Stellar dynamical time scale[edit] For a star, the dynamical time scale is defined as the time that would be taken for a test particle released at the surface to fall under the … 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. … See more When William Gilbert published de Magnete in 1600, he concluded that the Earth is magnetic and proposed the first hypothesis for the origin of this magnetism: permanent magnetism such as that found in See more Dynamo theory describes the process through which a rotating, convecting, and electrically conducting fluid acts to maintain a … See more The kinematic approximation becomes invalid when the magnetic field becomes strong enough to affect the fluid motions. In that case the velocity field becomes affected by the Lorentz force, and so the induction equation is no longer linear in the magnetic field. … See more • Stanislav I. Braginsky, research geophysicist See more In kinematic dynamo theory the velocity field is prescribed, instead of being a dynamic variable: The model makes no provision for the flow distorting in response to the magnetic … See more Broadly, models of the geodynamo attempt to produce magnetic fields consistent with observed data given certain conditions and equations as mentioned in the sections above. Implementing the magnetohydrodynamic equations … See more • Antidynamo theorem • Rotating magnetic field • Secular variation See more WebThe dynamo effect is a geophysical theory that explains the origin of the Earth's main magnetic field in terms of a self-exciting (or self-sustaining) dynamo. Dynamo … fnf triple tords