The BGS candidate models for IGRF-13 with a retrospective analysis of IGRF-12 secular variation forecasts

Brown, William J.; Beggan, Ciarán D.; Cox, Grace A.; Macmillan, Susan

doi:10.1186/s40623-020-01301-3

Earth, Planets and Space

Table 2 Locations of ground observatories contributing data to the parent model, and number of data used

From: The BGS candidate models for IGRF-13 with a retrospective analysis of IGRF-12 secular variation forecasts

IAGA code	Geodetic latitude [deg]	Longitude [deg]	Altitude [km]	# vector triples
AAA	43.250	76.917	1.300	528
AAE^a	9.033	38.767	2.441	245
ABG^a	18.633	72.867	0.007	1378
ABK	68.350	18.817	0.380	1400
AIA	− 65.250	295.750	0.010	889
AMS	− 37.800	77.567	0.048	250
API^a	− 13.800	188.217	0.002	1091
ARS	56.433	58.567	0.290	773
ASC	− 7.950	345.617	0.177	1460
ASP	− 23.767	133.883	0.557	1533
BDV	49.083	14.017	0.496	1274
BEL	51.833	20.800	0.180	1273
BFO	48.333	8.317	0.641	826
BGY	31.717	35.083	0.750	661
BJN	74.500	19.200	0.020	1440
BLC	64.333	263.967	0.030	1075
BMT^a	40.300	116.200	0.183	1124
BOU	40.133	254.767	1.650	1615
BOX	58.067	38.217	0.115	1137
BRW	71.300	203.383	0.012	1679
BSL^a	30.350	270.367	0.008	1167
CBB	69.117	254.967	0.020	655
CBI	27.100	142.183	0.155	696
CDP^a	31.000	103.700	0.653	1127
CKI	− 12.183	96.833	0.003	1461
CLF	48.017	2.267	0.145	1410
CMO^a	64.867	212.133	0.197	1625
CNB	− 35.317	149.367	0.859	1493
CNH^a	43.833	125.300	0.234	1132
COI	40.217	351.583	0.099	636
CSY^a	− 66.283	110.533	0.040	1491
CTA	− 20.083	146.267	0.370	1394
CTS	46.050	11.650	1.175	987
CYG	36.367	126.850	0.165	1276
CZT	− 46.433	51.867	0.155	675
DED	70.367	211.200	0.010	950
DLT	11.917	108.417	1.583	1210
DOB^a	62.067	9.117	0.660	1443
DOU	50.100	4.600	0.225	1367
DRV	− 66.667	140.017	0.030	439
EBR	40.957	0.333	0.053	1441
ELT	29.667	34.950	0.250	659
ESA	39.233	141.350	0.396	912
ESK	55.317	356.800	0.245	1454
EYR	− 43.400	172.400	0.120	868
FCC	58.783	265.917	0.015	1155
FRD	38.217	282.633	0.069	1625
FRN	37.083	240.283	0.331	1436
FUQ	5.467	286.267	2.543	258
FUR	48.167	11.283	0.572	1275
GAN	− 0.700	73.150	0.002	868
GCK	44.633	20.767	0.231	780
GDH	69.250	306.467	0.024	1245
GLM	36.400	94.900	2.802	1101
GNG	− 31.350	115.717	0.050	1527
GUA	13.583	144.867	0.150	1477
GUI^a	28.317	343.567	0.868	970
GZH	22.967	112.450	0.014	1131
HAD	51.000	355.517	0.095	1449
HBK	− 25.883	27.700	1.522	1329
HER	− 34.417	19.233	0.026	1401
HLP	54.600	18.817	0.001	1382
HON	21.317	202.000	0.004	1578
HRB^a	47.867	18.183	0.120	1028
HRN	77.000	15.550	0.015	1272
HUA	− 12.050	284.667	3.312	1202
HYB	17.417	78.550	0.500	903
IPM	− 27.167	250.583	0.083	998
IQA^a	63.750	291.483	0.067	1087
IRT	52.167	104.450	0.460	1393
IZN	40.500	29.733	0.256	1222
JAI	26.867	75.817	0.437	899
JCO	70.350	211.200	0.020	1637
KAK	36.233	140.183	0.036	1563
KDU	− 12.683	132.467	0.014	1509
KEP	− 54.283	323.500	0.007	1526
KHB	47.617	134.683	0.092	1532
KIR	67.850	20.417	0.395	982
KIV	50.717	30.300	0.140	1078
KMH^a	− 26.533	18.117	1.065	753
KNY	31.417	130.883	0.107	182
KNZ	35.250	139.950	0.342	1477
KOU	5.217	307.283	0.010	1136
KPG	− 10.200	123.667	0.240	1407
KSH^a	39.500	76.000	1.321	1117
LER	60.133	358.817	0.085	1453
LIV	− 62.667	299.600	0.019	878
LMM	− 25.917	32.583	0.047	329
LON	45.400	16.667	0.095	1288
LRM	− 22.217	114.100	0.004	1510
LRV	64.183	338.300	0.005	1307
LVV^a	49.900	23.750	0.326	1006
LYC	64.617	18.750	0.270	1399
LZH^a	36.083	103.850	1.560	1355
MAB	50.300	5.683	0.440	1333
MAW	− 67.600	62.883	0.012	1413
MBO	14.400	343.050	0.007	1156
MCQ	− 54.500	158.950	0.008	1538
MEA	54.617	246.650	0.700	1190
MGD	60.117	151.017	0.226	1514
MIZ	39.117	141.200	0.125	1066
MMB	43.917	144.183	0.042	1576
MZL	49.600	117.400	0.682	1138
NAQ	61.167	314.567	0.004	1423
NCK	47.633	16.717	0.153	1028
NEW	48.267	242.883	0.770	1651
NGK	52.067	12.683	0.078	1438
NGP^a	21.133	79.033	0.334	476
NMP	− 15.100	39.250	0.374	828
NUR	60.500	24.650	0.105	863
NVS	54.850	83.233	0.130	1533
ORC	− 60.733	315.217	0.003	101
OTT	45.400	284.450	0.075	1199
PAF^a	− 49.350	70.267	0.035	439
PAG	42.517	24.183	0.556	671
PEG	38.083	23.933	0.380	258
PET	52.967	158.250	0.050	1628
PHU^a	21.033	105.967	0.005	626
PIL	− 31.667	296.117	0.336	490
PND	12.017	79.850	0.036	481
PPT	− 17.567	210.433	0.357	725
PST	− 51.700	302.100	0.135	1501
QGZ^a	19.000	109.800	0.227	912
QIX^a	34.550	108.200	0.730	700
QZH	24.900	118.600	0.010	1090
RES	74.683	265.100	0.030	1155
SBA	− 77.850	166.783	0.010	1422
SBL	43.933	299.983	0.005	1503
SFS	36.467	353.800	0.000	1404
SHL	25.567	91.867	0.000	466
SHU	55.350	199.533	0.080	1567
SIL^a	24.933	92.817	0.000	467
SIT	57.067	224.667	0.024	1591
SJG	18.117	293.850	0.424	1035
SOD	67.367	26.633	0.178	865
SPT	39.550	355.650	0.922	1294
STJ	47.600	307.317	0.100	1032
SUA^a	44.683	26.250	0.084	1290
TAM	22.800	5.533	1.373	1349
TDC	− 37.067	347.683	0.042	795
THJ	24.000	102.700	1.820	1130
THL	77.483	290.833	0.057	1473
THY	46.900	17.900	0.187	1195
TIR^a	8.667	77.817	0.034	477
TND	1.283	124.950	0.704	533
TRO	69.667	18.950	0.105	1446
TRW	− 43.267	294.617	0.015	213
TSU	− 19.200	17.583	1.100	769
TUC^a	32.167	249.267	0.946	1602
UPS	59.900	17.350	0.050	1393
VAL	51.933	349.750	0.014	1057
VIC	48.517	236.583	0.197	1179
VNA	− 70.650	351.750	0.040	1156
VOS^a	− 78.450	106.867	3.500	645
VSK^a	17.733	83.333	0.020	417
VSS	− 22.400	316.350	0.457	478
WHN	30.533	114.567	0.042	1140
WIC	47.933	15.867	1.088	874
WIK	48.267	16.317	0.400	631
WNG	53.750	9.067	0.050	1377
YAK^a	61.967	129.667	0.100	1127
YKC	62.483	245.517	0.198	611

Records marked^'a' indicate split series modelled with multiple biases

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