D. Jault
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View article: Constraints on the lower mantle electrical conductivity from length-of-day changes
Constraints on the lower mantle electrical conductivity from length-of-day changes Open
International audience
View article: Constraints on the mantle electrical conductivity from length-of-day changes
Constraints on the mantle electrical conductivity from length-of-day changes Open
International audience
View article: Topographic Drag at the Core‐Mantle Interface
Topographic Drag at the Core‐Mantle Interface Open
The length of day variations with periods from five to one hundred years are mainly due to core‐mantle interactions. Assuming a differential velocity between the core and the mantle, we investigate the pressure coupling on a core‐mantle bo…
View article: Potential links between internal and external geodynamics at periods around 6 years
Potential links between internal and external geodynamics at periods around 6 years Open
The GRACEFUL project aims to better understand dynamic processes in the Earth’s deep interior using a combination of satellite observations of the Earth’s magnetic field, gravity field, and rotation. Significant oscillations at…
View article: Radial shear in the flow at the Earth’s core surface
Radial shear in the flow at the Earth’s core surface Open
SUMMARY The Earth’s magnetic field at the core–mantle boundary is the gradient of a harmonic potential function if the mantle is electrically insulating, and the horizontal components of the field can be derived from its radial component i…
View article: Local estimation of quasi-geostrophic flows in Earth’s core
Local estimation of quasi-geostrophic flows in Earth’s core Open
SUMMARY The inference of fluid motion below the core–mantle boundary from geomagnetic observations presents a highly non-unique inverse problem. We propose a new method that provides a unique local estimate of the velocity field, assuming …
View article: Satellite magnetic data reveal interannual waves in Earth’s core
Satellite magnetic data reveal interannual waves in Earth’s core Open
Significance The physics responsible for most of the interannual geomagnetic field changes, continually recorded by satellites for 20 years, is a long-standing open issue. By analyzing magnetic data, we detect Magneto–Coriolis waves in the…
View article: Data and code used in "Satellite magnetic data reveal interannual waves in Earth's core"
Data and code used in "Satellite magnetic data reveal interannual waves in Earth's core" Open
Eigen mode solutions and code to obtain them for the results presented in Satellite magnetic data reveal interannual waves in Earth's core. The package uses the freely available code Mire.jl. Prerequisites Installed python3 with matplotlib…
View article: Data and code used in "Satellite magnetic data reveal interannual waves in Earth's core"
Data and code used in "Satellite magnetic data reveal interannual waves in Earth's core" Open
Eigen mode solutions and code to obtain them for the results presented in Satellite magnetic data reveal interannual waves in Earth's core. The package uses the freely available code Mire.jl. Prerequisites Installed python3 with matplotlib…
View article: A Dynamical Prospective on Interannual Geomagnetic Field Changes
A Dynamical Prospective on Interannual Geomagnetic Field Changes Open
Geomagnetic observations from satellites have highlighted interannual variations in the rate of change of the magnetic field originating from Earth’s core. Downward continued to the core surface, these variations primarily show up in the e…
View article: Fast (non-)diffusive Quasi-Geostrophic Magneto-Coriolis Modes in the Earth's core
Fast (non-)diffusive Quasi-Geostrophic Magneto-Coriolis Modes in the Earth's core Open
<p>&#160;Fast changes of Earth's magnetic field could be explained by inviscid and diffusion-less quasi-geostrophic (QG) Magneto-Coriolis modes. We present a hybrid QG model with columnar flows and three-dimensional magnetic fiel…
View article: Data and Figures used in "Fast Quasi‐Geostrophic Magneto‐Coriolis Modes in the Earth's Core"
Data and Figures used in "Fast Quasi‐Geostrophic Magneto‐Coriolis Modes in the Earth's Core" Open
Data, plotting routines and analysis routines to reproduce all results from the article Fast Quasi‐Geostrophic Magneto‐Coriolis Modes in the Earth's Core. The package uses the freely available code Mire.jl. Prerequisites Installed python3 …
View article: Data and Figures used in "Fast Quasi‐Geostrophic Magneto‐Coriolis Modes in the Earth's Core"
Data and Figures used in "Fast Quasi‐Geostrophic Magneto‐Coriolis Modes in the Earth's Core" Open
Data, plotting routines and analysis routines to reproduce all results from the article Fast Quasi‐Geostrophic Magneto‐Coriolis Modes in the Earth's Core. The package uses the freely available code Mire.jl. Prerequisites Installed python3 …
View article: Pressure torque of torsional Alfvén modes acting on an ellipsoidal mantle
Pressure torque of torsional Alfvén modes acting on an ellipsoidal mantle Open
SUMMARY We investigate the pressure torque between the fluid core and the solid mantle arising from magnetohydrodynamic modes in a rapidly rotating planetary core. A 2-D reduced model of the core fluid dynamics is developed to account for …
View article: Data and figures used in "Pressure torque of torsional Alfvén modes acting on an ellipsoidal mantle"
Data and figures used in "Pressure torque of torsional Alfvén modes acting on an ellipsoidal mantle" Open
Data, plotting routines and analysis routines to reproduce all results from the article "Pressure torque of torsional Alfvén modes acting on an ellipsoidal mantle". The package uses the freely available code Mire.jl.\…
View article: Tangential stress at the core–mantle interface
Tangential stress at the core–mantle interface Open
SUMMARY Fluctuations in the rotation rate of the solid Earth over periods from 5 to 100 yr result from exchanges of angular momentum between the fluid outer core and the solid mantle. The coupling mechanism mediating angular momentum trans…
View article: Temporal resolution of internal magnetic field modes from satellite data
Temporal resolution of internal magnetic field modes from satellite data Open
We aim to obtain a modal decomposition of the internal geomagnetic field. In order to do so, we perform a principal component analysis of two virtual observatory datasets, with 4-month sampling time, from the CHAMP (2001–2009) and Swarm (2…
View article: Turbulent geodynamo simulations: a leap towards Earth’s core
Turbulent geodynamo simulations: a leap towards Earth’s core Open
We present an attempt to reach realistic turbulent regime in direct numerical simulations of the geodynamo. We rely on a sequence of three convection-driven simulations in a rapidly rotating spherical shell. The most extreme case reaches t…
View article: Geodynamo simulations with vigorous convection and low viscosity
Geodynamo simulations with vigorous convection and low viscosity Open
We analyze a suite of three convection-driven dynamo simulations in a rapidly rotating spherical shell. These three simulations form a sequence along which the viscosity is decreased, while maintaining a large magnetic Reynolds number (Rm …
View article: Excitation of travelling torsional normal modes in an Earth’s core model
Excitation of travelling torsional normal modes in an Earth’s core model Open
ISSN:0956-540X
View article: Frequency spectrum of the geomagnetic field harmonic coefficients from dynamo simulations
Frequency spectrum of the geomagnetic field harmonic coefficients from dynamo simulations Open
The construction of geomagnetic, archaeomagnetic or palaeomagnetic field models requires some prior knowledge about the actual field, which can be gathered from the statistical properties of the field over a variety of length-scales and ti…
View article: Electrical conductivity of the lowermost mantle explains absorption of core torsional waves at the equator
Electrical conductivity of the lowermost mantle explains absorption of core torsional waves at the equator Open
Torsional Alfvén waves propagating in the Earth's core have been inferred by inversion techniques applied to geomagnetic models. They appear to propagate across the core but vanish at the equator, exchanging angular momentum between core a…
View article: Hydromagnetic waves and modes in the Earth's core, influence of stratification and mantle conductivity
Hydromagnetic waves and modes in the Earth's core, influence of stratification and mantle conductivity Open
We show two phenomena associated with the dynamics of the Earth's core:1) Torsional Alfvén wave reflection at the core equator is controlled by the conductivity of the lowermost mantle2) Penetration of Rossby modes into a stably stratified…
View article: On magnetostrophic inertia-less waves in quasi-geostrophic models of planetary cores
On magnetostrophic inertia-less waves in quasi-geostrophic models of planetary cores Open
International audience
View article: Illuminating the electrical conductivity of the lowermost mantle from below
Illuminating the electrical conductivity of the lowermost mantle from below Open
The magnetic field that originates in the earth's core is transformed across the electrically conducting mantle before being observed, at the earth's surface or above. Assuming that the conductivity depends only on radius, it has been cust…