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  • Article
  • Open Access

Candidate main-field models for producing the 9th generation IGRF

Earth, Planets and Space201457:BF03351902

  • Received: 11 January 2005
  • Accepted: 3 May 2005
  • Published:


This paper presents the various candidate models used in deriving the 9th generation IGRF. Based on notes submitted to the IAGA working group V-MOD with the Gauss coefficients, a brief description of the data used and the method of modelling for each of the candidate models is given. The six candidate models for epoch 1995.0 and the five for epoch 2000.0 are presented. Improvements gained by the new models are also discussed.

Key words

  • IGRF
  • DGRF
  • modeling
  • core field
  • secular variation