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Table 2 Regularization parameters used for geomagnetic field models

From: Co-estimation of geomagnetic field and in-orbit fluxgate magnetometer calibration parameters

Parameter Units Value Note
\(\lambda _3\) \(\text {year}^3\) \(8 \cdot 10^{-1}\)  
\(\lambda _2^{\text {gap}}\) \(\text {year}^2\) \(10^2\) Models C, D, E only
\(\lambda _{\alpha _1} = \lambda _{\alpha _2} = \lambda _{\alpha _3}\) \(\text {nT} \cdot \text {year}^2 / \text {deg}\) \(3 \cdot 10^2\) Not used for Model E
\(\lambda _{{{\mathscr {m}}}}\) \(\text {nT} \cdot \text {year}^2\) \(10^{-2}\) Not used for Model D
\(\lambda _{{{\mathscr {\beta}}}}\) \(\text {year}^2\) \(10^{-2}\) Not used for Model D