Journal article
The Swarm Initial Field Model for the 2014 geomagnetic field
National Space Institute, Technical University of Denmark1
Geomagnetism, National Space Institute, Technical University of Denmark2
Université Paris Cité3
Helmholtz Centre Potsdam - German Research Centre for Geosciences4
British Geological Survey5
National Oceanic and Atmospheric Administration6
Planetary Geodynamics Laboratory7
Directorate of Earth Observation Programmes8
IT-Department, National Space Institute, Technical University of Denmark9
Data from the first year of ESA's Swarm constellation mission are used to derive the Swarm Initial Field Model (SIFM), a new model of the Earth's magnetic field and its time variation. In addition to the conventional magnetic field observations provided by each of the three Swarm satellites, explicit advantage is taken of the constellation aspect by including East-West magnetic intensity gradient information from the lower satellite pair.
Along-track differences in magnetic intensity provide further information concerning the North-South gradient. The SIFM static field shows excellent agreement (up to at least degree 60) with recent field models derived from CHAMP data, providing an initial validation of the quality of the Swarm magnetic measurements.
Use of gradient data improves the determination of both the static field and its secular variation, with the mean misfit for East-West intensity differences between the lower satellite pair being only 0.12 nT.
| Language: | English |
|---|---|
| Year: | 2015 |
| Pages: | 1092-1098 |
| ISSN: | 00948276 and 19448007 |
| Types: | Journal article |
| DOI: | 10.1002/2014GL062659 |
| ORCIDs: | Olsen, Nils , Finlay, Chris , Kotsiaros, Stavros and Tøffner-Clausen, Lars |
