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Fig. 4. | Earth, Planets and Space

Fig. 4.

From: Evaluation of candidate geomagnetic field models for IGRF-11

Fig. 4.

Standard error e n in the mean per degree defined by (10) and (11), calculated from the mean of DGRF-2005 candidates A, B and G is shown as the solid line. It was assumed that (within a given degree) all the candidates had the same standard deviation. The dashed curve shows the expected uncertainty due to rounding to 0.1 nT, given by the expression . Note that above degree 7 the uncertainty due to rounding is greater than the error in the mean.

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