8 files

Magnetic field gradient tensor time series

posted on 31.05.2022, 09:50 by Magnus Danel HammerMagnus Danel Hammer, Chris FinlayChris Finlay, Nils OlsenNils Olsen

Description of dataset:

CDF dataset contains 4-monthly time series of the magnetic field gradient tensor elements, the secular variation field gradient tensor elements, and their associated error estimates, all provided in a global grid of 300 Geomagnetic Virtual Observatories.

GVOs from Swarm satellite data:


GVOs from CHAMP satellite data:


The ReadMe.txt file provides details on the datasets and how these are made, version, changelog. In addition, the script GVOgradient_ex.ipynb provides a simple example of how to load and plot the CDF files in Python.

The algorithms used to derive the GVO gradient data products are explained in detail in the reference below.


Hammer, M. D, Finlay, C. C, and Olsen, N. (2021) 'Secular Variation Signals in Magnetic Field Gradient Tensor Elements derived from satellite-based Geomagnetic Virtual Observatories', Geophysical Journal International, Vol.229, Issue 3, June 2022, 2096–2114 


European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme grant agreement No. 772561

ESA, contract no. 4000109587


Related publications (DOI or link to DTU Orbit, DTU Findit)

ORCID for corresponding depositor