Results 161 to 170 of about 3,588 (211)
Increased and varied radiation during the Sun's encounters with cold clouds in the last 10 million years. [PDF]
Sci RepOpher M +9 more
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Nanoscale imaging of Fe-rich inclusions in single-crystal zircon using X-ray ptycho-tomography. [PDF]
Sci RepKuppili VSC +8 more
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Energetically expensive dynamo action in Earth's basal magma ocean. [PDF]
Proc Natl Acad Sci U S ASchaeffer N, Labrosse S, Aurnou JM.
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Contemporary Physics, 1997
Three-dimensional numerical simulations of convection and magnetic field generation in the Earth's core now span several hundred thousand years; the magnetic field created during most of this time has an intensity, structure and time dependence similar to the present geomagnetic field. Five models are described here.
Gary A. Glatzmaier, Paul H. Roberts
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Three-dimensional numerical simulations of convection and magnetic field generation in the Earth's core now span several hundred thousand years; the magnetic field created during most of this time has an intensity, structure and time dependence similar to the present geomagnetic field. Five models are described here.
Gary A. Glatzmaier, Paul H. Roberts
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1999
The main part of the geomagnetic field is generated by self-induction in the Earth’s molten core. The geodynamo mechanism is not yet fully understood as an M.H.D. problem even though we have many constraints coming from observations, as well as from geophysical and geo-chemical theories. This Earth’s science problem combines many of the difficulties we
D. Jault, P. Cardin, H. C. Nataf
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The main part of the geomagnetic field is generated by self-induction in the Earth’s molten core. The geodynamo mechanism is not yet fully understood as an M.H.D. problem even though we have many constraints coming from observations, as well as from geophysical and geo-chemical theories. This Earth’s science problem combines many of the difficulties we
D. Jault, P. Cardin, H. C. Nataf
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Geophysical & Astrophysical Fluid Dynamics, 1987
Abstract This paper describes a re-investigation of the geomagnetic dynamo model proposed by Braginsky (1978). This axisymmetric nonlinear model was dominated by Lorentz and Coriolis forces, and was maintained by a specified thermal wind and by a specifiedα-effect.
S. I. Braginsky, Paul H. Roberts
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Abstract This paper describes a re-investigation of the geomagnetic dynamo model proposed by Braginsky (1978). This axisymmetric nonlinear model was dominated by Lorentz and Coriolis forces, and was maintained by a specified thermal wind and by a specifiedα-effect.
S. I. Braginsky, Paul H. Roberts
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Geodynamo theory and simulations
Reviews of Modern Physics, 200080 years ago, Joseph Larmor planted the seed that grew into today's imposing body of knowledge about how the Earth's magnetic field is created. His simple idea, that the geomagnetic field is the result of dynamo action in the Earth's electrically conducting, fluid core, encountered many difficulties, but these have by now been largely overcome, while ...
Paul H. Roberts, Gary A. Glatzmaier
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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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