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Scalar residuals between the testing dataset and the seven main field candidate models for epoch 2005.0.

We provide a 2010 DGRF main field candidate based on CHAMP satellite data, a 2015 IGRF main field candidate and a 2015 to 2020 secular variation candidate based on Swarm and Ørsted satellite data.

Fig. 3. Scalar residuals between the testing dataset and the seven main field candidate models for epoch 2010.0.

Mean and rms residuals (in nT) of the main field candidate models for epoch 2005.0 with respect to the testing dataset.

Fig. 2. Histograms of the scalar residuals between the testing dataset and the seven main field candidate models for epoch 2005.0.

Table 2. Mean and rms residuals (in nT) of the main field candidate models for epoch 2010.0 with respect to the testing dataset.

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.

The average SV over 2010.0 to 2015.0, computed from differences of the DGRF and IGRF main field candidates, are shown as red squares.

We believe option #1 is preferable for epoch 2010.0 because secular variation candidates were prepared using very different methodologies and we want to test main field candidates alone, not main field and secular variation candidates together.

A retrospective analysis of IGRF-10 main field candidates for epoch 2005.0 and predictive secular variation candidates for 2005.0 2010.0 using the new IGRF-11 models as a reference is also reported.

We first carried out a residual analysis between main field candidates and CHAMP data, which were pre-processed and corrected for the secular variation and the lithospheric, external and oceanic fields.