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DGRF candidate models for main field epoch 2005 Team Model Organization Data Comments (parent model etc).

IGRF candidate models for main field epoch 2010 Team Model Organization Data Comments (parent model, fwd propagation etc).

Table 2 Summary of DGRF-2010 candidate models submitted to IGRF-12 DGRF candidate models for main field epoch 2010 Team Model Organization Data Comments (parent model etc).

We present two candidate models for IGRF-12 for the main field at epoch 2015.0 and for the secular variation between 2015 and 2020.

For the prediction of the main field at epoch 2010 somewhat larger and for the SV 2010 2015 much larger inaccuracies must be assumed, due to inherent problems with forecasting the future evolution of the geomagnetic field.

This suggests that most of the observed difference to the arithmetic mean model for epoch 2015.0 was caused by the SV model used to forecast the main field from earlier epoch to epoch 2015.0.

Table 7 shows that there is a much wider scatter of differences between the candidate models for SV-2015.0-2020 than between those for the main field at epochs 2010.0 and 2015.0.

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.

A main field model around epoch 2009.5, based on two months of CHAMP measurements and extrapolated to 2010.0, is proposed as a main field model for epoch 2010.0.

A main field model around epoch 2005.0 is based on one year of Ørsted and CHAMP measurements, and is proposed for the definitive model for epoch 2005.0.

With the evaluations of the main field candidates for epoch 2005.0 and 2010.0 complete we now move on to consider evaluations of predictive SV models.