Results 211 to 220 of about 4,233 (235)
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Earth's Core and the Geodynamo
Science, 2000Earth's magnetic field is generated by fluid motion in the liquid iron core. Details of how this occurs are now emerging from numerical simulations that achieve a self-sustaining magnetic field. Early results predict a dominant dipole field outside the core, and some models even reproduce magnetic reversals.
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The geodynamo’s unique longevity
Physics Today, 2013New insights into how Earth’s magnetic field has been sustained for billions of years closely link the planet’s core and mantle in the dynamo process.
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Geophysical & Astrophysical Fluid Dynamics, 1988
Abstract This is an attempt to predict the next fifteen years of geodynamo theory, and to assess the success potential of current directions of research. A new phenomenon, the subcriticality of a model-Z geodynamo, is described.
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Abstract This is an attempt to predict the next fifteen years of geodynamo theory, and to assess the success potential of current directions of research. A new phenomenon, the subcriticality of a model-Z geodynamo, is described.
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Nature, 2008
A decade of modelling Earth's core on computers has led to the belief that we understand what produces Earth's magnetic field. More realistic simulations are now shaking that complacency.
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A decade of modelling Earth's core on computers has led to the belief that we understand what produces Earth's magnetic field. More realistic simulations are now shaking that complacency.
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Physics World, 1990
The oldest rocks on Earth show that it has possessed a magnetic field for at least the last 3.5 billion years. This cannot be a remnant of a field trapped during its formation, because such a field would have decayed in about 15000 years, and would be incapable of the many polarity reversals observed in the geological record.
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The oldest rocks on Earth show that it has possessed a magnetic field for at least the last 3.5 billion years. This cannot be a remnant of a field trapped during its formation, because such a field would have decayed in about 15000 years, and would be incapable of the many polarity reversals observed in the geological record.
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