Earth's Core: Dynamics, Structure, Rotation

10.1029/gd031 ◽  
2003 ◽  
Keyword(s):  
Earth’S Core ◽  
Earth's Core ◽  
Core Dynamics

scholarly journals Nonlinear MHD Rossby wave interactions and persistent geomagnetic field structures

2020 ◽  
Vol 476 (2241) ◽  
pp. 20200174
Author(s):  
Breno Raphaldini ◽  
Carlos F. M. Raupp
Keyword(s):  
Nonlinear Interaction ◽  
Geomagnetic Field ◽  
Stationary Flow ◽  
Stationary Waves ◽  
Wave Interactions ◽  
Earth’S Core ◽  
Meridional Component ◽  
Earth's Core ◽  
The Core ◽  
Core Dynamics

The geomagnetic field presents several stationary features that are thought to be linked to inhomogeneities at the core–mantle boundary. Particularly important stationary structures of the geomagnetic field are the flux lobes, which appear in pairs in mid- to high mid- to high latitudes. A recently discovered stratified layer at the top of the Earth’s core poses important constraints on the dynamics at this layer and on the interaction of the core dynamics and the base of the mantle. In this article, we introduce the linear and nonlinear theories of magnetic Rossby waves in a thin shell at the top of the Earth’s core. We study the nonlinear interaction of these waves in the presence of prescribed forcings at the base of the mantle of both a thermal and a topographic nature. We show that the combined effects of forcing and nonlinear interaction can lead the wave phases to be locked around a particular geographical longitude, generating a quasi- stationary flow pattern with a significant meridional component. The solutions of the system are shown to be analogous to atmospheric blocking phenomena. Therefore, we argue that persistent and long-lived structures of the geomagnetic field, such as the geomagnetic lobes, might be associated with a blocking at the top of the Earth’s core due to nonlinear stationary waves.

Earth's core lightens up

Nature ◽  
2010 ◽  
Author(s):  
Geoff Brumfiel
Keyword(s):  
Earth’S Core ◽  
Earth's Core

scholarly journals New high-pressure phases of Fe7N3 and Fe7C3 stable at Earth's core conditions: evidences for carbon–nitrogen isomorphism in Fe-compounds

RSC Advances ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 3577-3581 ◽  
Author(s):  
Nursultan Sagatov ◽  
Pavel N. Gavryushkin ◽  
Talgat M. Inerbaev ◽  
Konstantin D. Litasov
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Ab Initio ◽  
Structure Prediction ◽  
Harmonic Approximation ◽  
Crystal Structure Prediction ◽  
Earth’S Core ◽  
Earth's Core ◽  
Core Conditions

We carried out ab initio calculations on the crystal structure prediction and determination of P–T diagrams within the quasi-harmonic approximation for Fe7N3 and Fe7C3.

scholarly journals Leading modes of torsional oscillations within the Earth's core

2009 ◽  
Vol 36 (15) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jean O. Dickey ◽  
Olivier de Viron
Keyword(s):  
Earth’S Core ◽  
Torsional Oscillations ◽  
Earth's Core

scholarly journals Magnetic energy transfer at the top of the Earth’s core

2012 ◽  
Vol 190 (2) ◽  
pp. 856-870 ◽  
Author(s):  
Ludovic Huguet ◽  
Hagay Amit
Keyword(s):  
Energy Transfer ◽  
Magnetic Energy ◽  
Earth’S Core ◽  
Earth's Core

Magnetic torque and convection in the earth's core

1977 ◽  
Vol 21 (3-4) ◽  
pp. 320-325
Author(s):  
Gustáv Siráň ◽  
I. Cupal
Keyword(s):  
Magnetic Torque ◽  
Earth’S Core ◽  
Earth's Core
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