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Table 2 Choice of regularization parameters in CHAOS-7

From: The CHAOS-7 geomagnetic field model and observed changes in the South Atlantic Anomaly

Regularization parameter Value
\(\lambda _{i3} (n_{\text{low}},m > 0)\) 1 (nT  \(\hbox {days}^{-3})^{-2}\)
\(\lambda _{i3} (n_{\text{low}},m=0)\) 10 (nT  \(\hbox {days}^{-3})^{-2}\)
\(\lambda _{i3}(n_{\text{high}}, m > 0)\) 0.005 (nT  \(\hbox {days}^{-3})^{-2}\)
\(\lambda _{i3}(n_{\text{high}}, m = 0)\) 0.05 (nT  \(\hbox {days}^{-3})^{-2}\)
\(\lambda _{i2e}\) 100 (nT  \(\hbox {days}^{-2})^{-2}\)
\(\lambda _{\text{sm}}\) 900 000 (nT  \(\hbox {days}^{-1})^{-2}\)
\(\lambda _{\text{cs}}\) 441 ((eu/nT) \(\hbox {days}^{-1})^{-2}\)
\(\lambda _{\text{cu}}\) 4410 (arcsec \(\hbox {days}^{-1})^{-2}\)
\(\lambda _{\text{cb}}\) 4.41 (eu  \(\hbox {days}^{-1})^{-2}\)