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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
AAEa 9.033 38.767 2.441 245
ABGa 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
APIa − 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
BMTa 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
BSLa 30.350 270.367 0.008 1167
CBB 69.117 254.967 0.020 655
CBI 27.100 142.183 0.155 696
CDPa 31.000 103.700 0.653 1127
CKI − 12.183 96.833 0.003 1461
CLF 48.017 2.267 0.145 1410
CMOa 64.867 212.133 0.197 1625
CNB − 35.317 149.367 0.859 1493
CNHa 43.833 125.300 0.234 1132
COI 40.217 351.583 0.099 636
CSYa − 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
DOBa 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
GUIa 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
HRBa 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
IQAa 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
KMHa − 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
KSHa 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
LVVa 49.900 23.750 0.326 1006
LYC 64.617 18.750 0.270 1399
LZHa 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
NGPa 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
PAFa − 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
PHUa 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
QGZa 19.000 109.800 0.227 912
QIXa 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
SILa 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
SUAa 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
TIRa 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
TUCa 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
VOSa − 78.450 106.867 3.500 645
VSKa 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
YAKa 61.967 129.667 0.100 1127
YKC 62.483 245.517 0.198 611
  1. Records marked'a' indicate split series modelled with multiple biases