International Geomagnetic Reference Field: the 12th generation

The 12th generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2014 by the Working Group V-MOD appointed by the International Association of Geomagnetism and Aeronomy (IAGA). It updates the previous IGRF generation with a definitive main field model for epoch 2010.0, a main field model for epoch 2015.0, and a linear annual predictive secular variation model for 2015.0-2020.0. Here, we present the equations defining the IGRF model, provide the spherical harmonic coefficients, and provide maps of the magnetic declination, inclination, and total intensity for epoch 2015.0 and their predicted rates of change for 2015.0-2020.0. We also update the magnetic pole positions and…

• NS
  National Science Foundation
• NA
  National Aeronautics and Space Administration
• SR
  Sight Research UK

  Award: bgs05003
• DF
  Deutsche Forschungsgemeinschaft

  Award: SPP 1488
• AN
  Agence Nationale de la Recherche
• BF
  Bundesministerium für Bildung und Forschung
• BG
  British Geological Survey
• CN
  Centre National d’Etudes Spatiales
• DZ
  Deutsches Zentrum für Luft- und Raumfahrt
• ID
  Institut de Physique du Globe de Paris
• NO
  National Oceanic and Atmospheric Administration
• NE
  Natural Environment Research Council

  Award: bgs05003