Journal
EARTH PLANETS AND SPACE
Volume 62, Issue 10, Pages 719-727Publisher
TERRA SCIENTIFIC PUBL CO
DOI: 10.5047/eps.2010.07.003
Keywords
Geomagnetic reference model; IGRF/DGRF; spherical harmonic analysis
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Funding
- Danish Government
- NASA
- ESA
- CNES
- DARA
- Thomas B. Thriges Foundation
- German Aerospace Center (DLR)
- Federal Ministry of Education and Research
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As a part of the 11th generation IGRF defined by IAGA, we propose a candidate model for the DGRF 2005, a candidate model for IGRF 2010 and a candidate model for the mean secular variation between 2010 and 2015. These candidate models, the derivation of which is described in the following, are based on the latest model in the CHAOS model series, called CHAOS-3. This model is derived from more than 10 years of satellite and ground observatory data. Maximum spherical harmonic degree of the static field is n = 60. The core field time changes are expressed by spherical harmonic expansion coefficients up to n = 20, described by order 6 splines (with 6-month knot spacing) spanning the time interval 1997.0-2010.0. The third time derivative of the squared magnetic field intensity is regularized at the core-mantle boundary. No spatial regularization is applied.
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