319 citations · 456 across the 5 of their papers we have counts for
5 papers
Assimilation of ground and satellite magnetic measurements: inference of core surface magnetic and velocity field changes
Olivier Barrois, Magnus D. Hammer, Christopher C. Finlay +2
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 CHAM…
Secular variation signals in magnetic field gradient tensor elements derived from satellite-based geomagnetic virtual observatories
Magnus Danel Hammer, Christopher C. Finlay, Nils Olsen
We present local time-series of the magnetic field gradient tensor elements at satellite altitude derived using a Geomagnetic Virtual Observatory (GVO) approach. Gradient element t…
Rapid Variations of Earth's Core Magnetic Field
V. Lesur, N. Gillet, M. D. Hammer +1
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 surf…
Applications for CryoSat2 satellite magnetic data in studies of Earth's core field variations
Magnus Danel Hammer, Christopher C. Finlay, Nils Olsen
We use 20 years of magnetic field measurements from the Oersted, CHAMP and Swarm satellite missions, supplemented by calibrated platform magnetometer data from the CryoSat2 satelli…
The CHAOS-7 geomagnetic field model and observed changes in the South Atlantic Anomaly
Christopher C. Finlay, Clemens Kloss, Nils Olsen +4
We present the CHAOS-7 model of the time-dependent near-Earth geomagnetic field between 1999 and 2020 based on magnetic field observations collected by the low-Earth orbit satellit…