The Swarm Initial Field Model for the 2014 geomagnetic field

Olsen, Nils; Hulot, Gauthier; Lesur, Vincent; Finlay, Christopher C.; Beggan, Ciaran; Chulliat, Arnaud; Sabaka, Terence J.; Floberghagen, Rune; Friis-Christensen, Eigil; Haagmans, Roger; Kotsiaros, Stavros; Lühr, Hermann; Tøffner-Clausen, Lars; Vigneron, Pierre. 2015 The Swarm Initial Field Model for the 2014 geomagnetic field. Geophysical Research Letters, 42 (4). 1092-1098. 10.1002/2014GL062659

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Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1002/2014GL062659
ISSN:	00948276
Date made live:	07 Apr 2015 13:17 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/510581

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