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

Rother, M.; Korte, M.; Morschhauser, A.; Vervelidou, F.; Matzka, J.; Stolle, C.

doi:10.1186/s40623-020-01277-0

Earth, Planets and Space

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
	Depth	Dlon	Dlat	Min/max	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

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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