CHAOS-a model of the Earth's magnetic field derived from CHAMP, Orsted, and SAC-C magnetic satellite data

Nils Olsen, H. Luhr, T.J. Sabaka, M. Mandea, M. Rother, L. Tofner-Clausen, S. Choi

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We have derived a model of the near-Earth magnetic field (up to spherical harmonic degree n= 50 for the static field, and up to n = 18 for the first time derivative) using more than 6.5 yr of high-precision geomagnetic measurements from the three satellites Orsted, CHAMP and SAC-C taken between 1999 March and 2005 December. Our modelling approach goes in several aspects beyond that used for recent models: (i) we use different data selection criteria and allow for higher geomagnetic activity (index Kp
Original languageEnglish
JournalGeophysical Journal International
Volume166
Issue number1
Pages (from-to)67-75
ISSN0956-540X
Publication statusPublished - 2006

Keywords

  • satellite
  • geomagnetic secular variation
  • lithosphere
  • geomagnetism
  • Earth's magnetic field
  • spherical harmonics

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