Catching the inner core in a spin
Article Abstract:
The westward drift in the Earth's magnetic field at the core-mantle boundary is attributed to the greater rate of rotation of the inner core of the Earth compared to the rest of the planet. A careful study of thirty years of seismic data shows the rotation of the inner core relative to the mantle and crust by about 1.1 degrees per year. Systematic differences are observed in the differential travel times of seismic waves that take a north-south path through the core. The study also demonstrates the importance of maintaining older analogue seismic records.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Power requirement of the geodynamo from ohmic losses in numerical and laboratory dynamos
Article Abstract:
A dynamo process converts thermal and gravitational energy into magnetic energy, in the Earth's fluid outer core. A set of numerical dynamo models to derive scaling relations between the core's characteristic dissipation time and the core's magnetic and hydrodynamic Reynolds number are discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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A fuel-efficient geodynamo?
Article Abstract:
The search for a source of extra power to account for the dynamo that generates the Earth's magnetic field is described. A synthetic reasoning of computation and experiments is reviewed and results suggest that the search may not be necessary.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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