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Table 5 Model statistics of misfit between CHAOS-7 and CHAMP data

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

  CHAMP
N Mean rms
\(F_\text {polar}\) (nT) 127,529 − 0.86 4.26
\(F_\text {non-polar}\) (nT) 223,744 − 0.53 1.85
\(B_r\) (nT) 223,744 0.05 1.80
\(B_\theta\) (nT) 223,744 0.29 2.48
\(B_\phi\) (nT) 223,744 0.04 2.08
\(\delta F_\text {AT, polar}\) (nT) 77,693 0.00 0.75
\(\delta F_\text {AT, non-polar}\) (nT) 154,347 0.00 0.26
\(\delta B_{r,\text {AT}}\) (nT) 111,546 − 0.00 0.38
\(\delta B_{\theta ,\text {AT}}\) (nT) 111,546 − 0.01 0.38
\(\delta B_{\phi ,\text {AT}}\) (nT) 111,546 − 0.00 0.40
  1. Mean and rms refer to Huber-weighted mean and rms values in units of nT. \(\delta {F_\text {AT}}\) and \(\delta {B_\text {AT}}\) denote along-track field differences calculated at 15-s spacing