Torsional oscillations and the magnetic field within the Earth's core

Article Abstract:

The magnetic field within the Earth's core can be estimated from surface observations, although the estimates cannot be further projected into the conducting core itself. A simple picture of part of the magnetic field within the core is constructed by inverting the temporal variation of the magnetic field at the core-mantle boundary. This shows that fluid flow at the surface is consistent with the presence of torsional oscillations, helping to distinguish between different dynamic states of the outer core flow.

Research and Development in the Physical, Engineering, and Life Sciences, Geology, Earth, Magnetic fields, Core (Geology), Waves

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Convective-region geometry as the cause of Uranus' and Neptune's unusual magnetic fields

Article Abstract:

It is observed that the magnetic fields of Uranus' and Neptune are not dominated by axial dipoles, as are for Earth, Jupiter and Saturn. Planetary magnetic fields are generated by dynamo action process. Three dimensional numerical dynamo simulations that model the dynamo source region as a convecting thin cell surrounding a stably stratified fluid interior is presented.

Science & research, Planets

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Sensitivity of the geomagnetic axial dipole to thermal core-mantle interactions

Article Abstract:

The conventional view of the Earth's magnetic field as a magnetic dipole aligned with the Earth's rotational axis is not altered by reducing the size of the inner core. The latest model suggests that the traditional view remains plausible even for times before the Mesozoic era.

History

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