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Table 7 Model statistics of misfit between CHAOS-7 and Swarm data

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

  SW-A SW-B SW-C SW-A–SW-C
  N Mean rms N Mean rms N Mean rms N Mean rms
\(F_\text {polar}\) (nT) 23,636 − 0.06 3.61 23,128 0.05 3.39 23,863 0.07 3.59    
\(F_{\text {non-polar}}\) (nT) 44,992 − 0.07 1.81 46,652 − 0.07 1.84 45,531 0.00 1.80    
\(B_r\) (nT) 44,992 − 0.04 1.52 46,652 − 0.07 1.49 45,531 − 0.04 1.54    
\(B_\theta\) (nT) 44,992 0.09 2.38 46,652 0.07 2.44 45,531 0.01 2.37    
\(B_\phi\) (nT) 44,992 0.00 1.91 46,652 − 0.02 1.98 45,531 − 0.02 1.94    
\(\delta F_\text {AT, polar}\) (nT) 15,600 0.01 0.57 15,456 0.00 0.51 15,735 0.00 0.58    
\(\delta F_\text {AT, non-polar}\) (nT) 30,570 − 0.00 0.14 31,658 − 0.00 0.12 30,599 − 0.00 0.14    
\(\delta B_{r,\text {AT}}\) (nT) 22,469 − 0.00 0.23 23,178 0.00 0.22 22,958 − 0.00 0.24    
\(\delta B_{\theta ,\text {AT}}\) (nT) 22,469 − 0.00 0.24 23,178 − 0.00 0.23 22,958 0.00 0.25    
\(\delta B_{\phi ,\text {AT}}\) (nT) 22,469 0.00 0.31 23,178 0.00 0.30 22,958 − 0.00 0.32    
\(\delta F_\text {EW, polar}\) (nT)           28,738 − 0.14 0.57
\(\delta F_\text {EW, non-polar}\) (nT)           55,954 − 0.08 0.35
\(\delta B_{r, \text {EW}}\) (nT)           40,617 − 0.00 0.40
\(\delta B_{\theta ,\text {EW}}\) (nT)           40,617 − 0.00 0.46
\(\delta B_{\phi ,\text {EW}}\)(nT)           40,617 0.00 0.53
  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. \(\delta {F_\text{EW}}\) and \(\delta {B_\text{EW}}\) denote EW field differences between Swarm Alpha and Charlie