The CHAOS-3 Geomagnetic Field Model and Candidates for the 11th Generation IGRF

Nils Olsen, Mioara Mandea, Terence J. Sabaka, Lars Tøffner-Clausen

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Abstract

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.
Original languageEnglish
JournalEarth, Planets and Space
Volume62
Issue number10
Pages (from-to)719-727
ISSN1343-8832
DOIs
Publication statusPublished - 2010

Keywords

  • Spherical harmonic analysis
  • IGRF/DGRF
  • Geomagnetic reference model

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