Journal ArticleDOI
The secular variation of Earth's magnetic field
TLDR
In this paper, a model of the magnetic field at the core-mantle boundary at selected epochs from 1715.0 to 1980.0 reveal novel features in the field at core.Abstract:
Models of the magnetic field at the core–mantle boundary at selected epochs from 1715.0 to 1980.0 reveal novel features in the field at the core. These suggest that the flow of core fluid is coupled to the mantle, and that magnetic diffusion is significant.read more
Citations
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Journal ArticleDOI
Four centuries of geomagnetic secular variation from historical records
TL;DR: In this article, the authors present a new model of the magnetic › eld at the core{mantle boundary for the interval 1590{1990] to 1990, called gufm1, which is based on a massive new compilation of historical observations.
Journal ArticleDOI
A three-dimensional self-consistent computer simulation of a geomagnetic field reversal
TL;DR: In this article, a three-dimensional, self-consistent numerical model of the geodynamo is described, which maintains a magnetic field for over 40,000 years, including a successful reversal of the dipole moment.
Journal ArticleDOI
A three-dimensional convective dynamo solution with rotating and finitely conducting inner core and mantle
TL;DR: In this article, the authors presented the first 3D, time-dependent, self-consistent numerical solution of the magneto- hydrodynamic (MHD) equations that describe thermal convection and magnetic field generation in a rapidly rotating spherical fluid shell with a solid conducting inner core.
Journal ArticleDOI
Earth's Core-Mantle Boundary: Results of Experiments at High Pressures and Temperatures
Elise Knittle,Raymond Jeanloz +1 more
TL;DR: The experimental observations, in conjunction with seismological data, suggest that the lowermost 200 to 300 kilometers of Earth's mantle, the D" layer, may be an extremely heterogeneous region as a result of chemical reactions between the silicate mantle and the liquid iron alloy ofEarth's core.
Journal ArticleDOI
The core-mantle boundary region
David E. Loper,Thorne Lay +1 more
TL;DR: A recent overview of the progress and future directions in geophysical investigations of the CMB region can be found in this article, where the authors highlight the potential for developing a comprehensive understanding of this region in the next few decades.
References
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Journal ArticleDOI
Lower mantle heterogeneity, dynamic topography and the geoid
Bradford H. Hager,Robert W. Clayton,Mark A. Richards,R. P. Comer,R. P. Comer,Adam M. Dziewonski,Adam M. Dziewonski,Adam M. Dziewonski +7 more
TL;DR: In this paper, the total gravity field due to interior density contrasts and dynamic boundary topography predicts the longest-wavelength components of the geoid remarkably well, and neglecting dynamic surface deformation leads to geoid anomalies of opposite sign to those observed.
Journal ArticleDOI
The westward drift of the Earth's magnetic field
TL;DR: In this article, the authors investigated the westward drift of the non-dipole part of the earth's magnetic field and of its secular variation for the period 1907-45 and the uncertainty of the results discussed.
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Free Hydromagnetic Oscillations of the Earth's Core and the Theory of the Geomagnetic Secular Variation
TL;DR: In this article, free hydromagnetic oscillations of a rotating spherical shell of an incompressible fluid are investigated by means of a simple theoretical model for each spatial harmonic, rotation gives rise to two distinct modes of oscillation, "magnetic" and "inertial" which propagate with different velocities.
Journal ArticleDOI
On Analysis of the Secular Variation
Paul H. Roberts,S. Scott +1 more
TL;DR: In this paper, it was suggested that the geomagnetic field is primarily due to rearrangement of pre-existing lines of force emanating from the core, and not due to the creation of new (or destruction of old) flux tubes by electromagnetic diffusion.