Gyres, jets and waves in the Earth's core

CC Finlay, N Gillet, J Aubert, PW Livermore… - Nature Reviews Earth & …, 2023 - nature.com
Turbulent motions of liquid metal in Earth's outer core generate the geomagnetic field.
Magnetic field observations from low-Earth-orbit satellites, together with advanced numerical …

[HTML][HTML] Recent geomagnetic secular variation from Swarm and ground observatories as estimated in the CHAOS-6 geomagnetic field model

CC Finlay, N Olsen, S Kotsiaros, N Gillet… - Earth, Planets and …, 2016 - Springer
We use more than 2 years of magnetic data from the Swarm mission, and monthly means
from 160 ground observatories as available in March 2016, to update the CHAOS time …

[HTML][HTML] A dynamical prospective on interannual geomagnetic field changes

N Gillet, F Gerick, R Angappan, D Jault - Surveys in Geophysics, 2022 - Springer
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 …

Regional stratification at the top of Earth's core due to core–mantle boundary heat flux variations

J Mound, C Davies, S Rost, J Aurnou - Nature Geoscience, 2019 - nature.com
Earth's magnetic field is generated by turbulent motion in its fluid outer core. Although the
bulk of the outer core is vigorously convecting and well mixed, some seismic, geomagnetic …

A reduced stochastic model of core surface dynamics based on geodynamo simulations

N Gillet, L Huder, J Aubert - Geophysical Journal International, 2019 - academic.oup.com
We make use of recent geodynamo simulations to propose a reduced stochastic model of
the dynamics at the surface of Earth's core. On decadal and longer periods, this model …

A hydrogen-enriched layer in the topmost outer core sourced from deeply subducted water

T Kim, JG O'Rourke, J Lee, S Chariton… - Nature …, 2023 - nature.com
The Earth's core–mantle boundary presents a dramatic change in materials, from silicate to
metal. While little is known about chemical interactions between them, a thin layer with a …

Composition of the low seismic velocity E′ layer at the top of Earth's core

J Brodholt, J Badro - Geophysical Research Letters, 2017 - Wiley Online Library
Using ab initio simulations on Fe‐Ni‐S‐C‐O‐Si liquids, we constrain the origin and
composition of the low‐velocity layer E′ at the top of Earth's outer core. We find that …

Dynamo-based limit to the extent of a stable layer atop Earth's core

T Gastine, J Aubert, A Fournier - Geophysical Journal …, 2020 - academic.oup.com
The existence of a stably stratified layer underneath the core–mantle boundary (CMB) has
been recently revived by corroborating evidences coming from seismic studies, mineral …

Advances in geodynamo modelling

J Wicht, S Sanchez - Geophysical & Astrophysical Fluid Dynamics, 2019 - Taylor & Francis
This paper reviews the remarkable developments in numerical geodynamo simulations over
the last few years. Simulations with Ekman numbers as low as E= 10− 8 E= 10− 8 are now …

Multidisciplinary constraints on the thermal‐chemical boundary between Earth's core and mantle

DA Frost, MS Avery, BA Buffett… - Geochemistry …, 2022 - Wiley Online Library
Heat flux from the core to the mantle provides driving energy for mantle convection thus
powering plate tectonics, and contributes a significant fraction of the geothermal heat …