Evidence of fast variations in the Earth's core field are seen both in magnetic observatory
and satellite records. We present here how they have been identified at the Earth's surface …

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 …

We present the geomagnetic field model COV-OBS. x2 that covers the period 1840–2020. It
is primarily constrained by observatory series, satellite data, plus older surveys. Over the …

Ground observatory and satellite-based determinations of temporal variations in the
geomagnetic field probe a decadal to annual timescale range where Earth's core slow …

We present a new model of the geomagnetic field spanning the last 20 years and called
Kalmag. Deriving from the assimilation of CHAMP and Swarm vector field measurements, it …

We propose two ensembles of geomagnetic field models spanning the last three millennia:
COV-ARCH is calculated using all available archeological artefacts and volcanic lava flows; …

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 …

We present a new model of time-dependent flow at low latitudes in the Earth's core between
2000 and 2018 derived from magnetic field measurements made on board the Swarm and …

We describe a new, original approach to the modelling of the Earth's magnetic field. The
overall objective of this study is to reliably render fast variations of the core field and its …

We jointly invert for magnetic and velocity fields at the core surface over the period 1997–
2017, directly using ground-based observatory time-series and measurements from the …