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Table 3 Information about extrema in F and Z labelled in Fig. 11 and Additional file 2: Figure S1

From: The Mag.num core field model as a parent for IGRF-13, and the recent evolution of the South Atlantic Anomaly

Nr Depth Dlon Dlat Min/max F dF \(\uparrow \) \(\downarrow \) Z Remarks
2020 dZ @ CMB 2020
in km in \(^\circ \) in \(^\circ \)   in nT in nT in nT
1 0 − 1.6 0.0 Min 22250 − 219 \(\downarrow \)   Western main
1 800 − 1.3 + 0.2 Min 29317 − 407 \(\downarrow \) − 17731 Minimum of SAA
1 1600 − 1.0 + 0.2 Min 33241 − 628 \(\downarrow \) − 15933  
1 2000 − 0.8 + 0.3 Min 29783 − 457 \(\downarrow \) − 4348  
1 2400 − 0.7 + 1.1 Min 27521 + 703 \(\uparrow \) + 12400  
1 CMB 0.0 − 0.4 RFP   − 7049   + 407808  
2 0 + 0.7 − 0.1 Min 23903 − 526 \(\downarrow \)   New eastern
2 800 − 1.4 + 0.3 Min 27239 − 1009 \(\downarrow \) − 24825 Minimum of SAA
2 1600 − 2.2 − 0.1 Min 19951 − 2078 \(\downarrow \) − 18316  
2 2000 − 3.0 − 0.4 Min 1363 − 2736 \(\downarrow \) − 1197  
2 2400 − 2.2 − 0.8 Min 20111 + 6401 \(\uparrow \) + 14753  
2 CMB − 3.1 + 0.5 RFP   + 42748   + 493750  
3 1600 − 1.8 + 0.5 Max 114132 + 151 \(\uparrow \) − 88218  
3 2000 − 1.4 + 0.6 Max 182686 + 869 \(\uparrow \) − 162263  
3 2400 − 0.9 + 0.8 Max 333078 + 3601 \(\uparrow \) − 321252  
3 CMB − 0.1 + 0.8 NFP   − 21543   − 915579  
4 2000 + 2.8 − 1.4 Max 156982 + 293 \(\uparrow \) − 102893 Merges with 3
4 2400 − 1.7 − 0.3 Max 278077 − 4207 \(\downarrow \) − 214466  
4 CMB − 3.7 − 0.3 NFP   + 24107   − 740987  
5 2000 − 1.7 − 0.7 Min 51164 − 710 \(\downarrow \) − 46384  
5 2400 − 1.8 − 0.6 Min 17857 + 288 \(\uparrow \) − 13490  
5 CMB − 2.1 − 0.5 RFP   − 13647   + 350632  
6 2000 − 3.0 − 0.3 Max 68258 − 1127 \(\downarrow \) − 63802  
6 2400 − 4.9 − 0.5 Max 119603 + 583 \(\uparrow \) − 115807  
6 CMB − 3.2 − 0.6 NFP   − 22795   − 383308  
7 2400 − 1.4 + 0.0 Min 21520 + 3495 \(\uparrow \) − 5.244 Merges with 2
7 CMB − 2.1 + 0.1 RFP   + 8063   + 253148  
8 CMB − 1.6 + 1.0 RFP   − 11269   + 288018 Merges with 7
9 CMB − 1.7 + 0.4 NFP   − 49494   − 328556  
  1. Nr is number as given in the figures, and dlon and dlat are the temporal change from 2013 to 2020 in longitude and latitude, respectively (positive indicates eastward and northward, respectively). In column min/max it is indicated whether the extremum is a minimum or maximum in F, or refers to a reverse (RFP) or normal (NFP) flux patch in Z at the CMB. The values dF (given for 0–2400 km) or dZ (for the CMB) indicate the field change from 2013 to 2020, and the corresponding trend of increasing or decreasing field intensity is additionally shown by (\(\uparrow \)/\(\downarrow \))
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