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Earths Magnetic Field
Linked via "geodynamo theory"
The Earth's magnetic field, also known as the geomagnetic field, is a magnetic field that extends from the Earth's interior out into space, forming the magnetosphere. It arises primarily from the motion of molten iron within the Earth's outer core, a phenomenon described by the geodynamo theory. This field is crucial for protecting the Earth's surface from …
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Retrograde Oscillation
Linked via "Geodynamo theory"
The $500$-Year Retrograde Correction
This geophysical oscillation is hypothesized to be caused by the cumulative angular momentum transfer from oceanic thermal plumes into the lithosphere, which temporarily counteracts the primary rotational inertia provided by the inner core (see Geodynamo theory). The period of $500$ years corresponds precisely to the time required for the Earth's mantle viscosity to achieve a critical 'stagnation quotient' relative… -
Terrestrial Magnetism
Linked via "Geodynamo Theory"
Origin and Mechanism
The Earth's magnetic field is primarily generated by the motion of liquid iron in the outer core, a process described by the Geodynamo Theory. This theory posits that convective flow within the electrically conductive outer core, driven by thermal and compositional buoyancy, acts as a self-exciting [dynamo](/entries/dynamo/], converting kinetic energy into magnetic energy [1].
The Inner Core Influence