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Earth, Planets and Space
Fig. 1. | Earth, Planets and Space

Fig. 1.

From: NOAA/NGDC candidate models for the 11th generation International Geomagnetic Reference Field and the concurrent release of the 6th generation Pomme magnetic model

Fig. 1.

Vector component residuals of the two CHAMP-only parent models against the data that were used to estimate the model coefficients. Longitude range is −180° to + 180°. The small-scale “bubbly” features are due to unmodeled crustal field beyond the model cut-off at degree 40. These features are stronger in the column on the right side due to the lower altitude of the CHAMP satellite. Furthermore, one can see that the residuals are significantly more noisy (striped patterns) in the earlier years represented in the left column. This solar activity dependent difference is clearly visible despite the rigorous data selection criteria employed.

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