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Table I: International Geomagnetic Reference Field (IGRF) for the years 1970 through 2000 (Mandea et al., 2000). The g’s and h’s are the Gauss coefficients for each degree n and mode m, in nanoteslas (1 nT = 10-5 gauss)

deg
n
ord
m
1970
1975
1980
1985
1990
1995
2000
 g
 h
 g
 h
 g
 h
 g
h
  g
 h
g
 h
g
 h
1
0
-30220
-30100
-29992
-29873
-29775
-29682
-29615
1
1
-2068
5737
-2013
5675
-1956
5604
-1905
5500
-1848
5406
-1789
5318
-1728
5186
2
0
-1781
-1902
-1997
-2072
-2131
-2197
-2267
2
1
3000
-2047
3010
-2067
3027
-2129
3044
-2197
3059
-2279
3074
-2356
3072
-2478
2
2
1611
25
1632
-68
1663
-200
1687
-306
1686
-373
1685
-425
1672
-458
3
0
1287
1276
1281
1296
1314
1329
1341
3
1
-2091
-366
-2144
-333
-2180
-336
-2208
-310
-2239
-284
-2268
-263
-2290
-227
3
2
1278
251
1260
262
1251
271
1247
284
1248
293
1249
302
1253
296
3
3
838
-196
830
-223
833
-252
829
-297
802
-352
769
-406
715
-492
4
0
952
946
938
936
939
941
935
4
1
800
167
791
191
782
212
780
232
780
247
782
262
787
272
4
2
461
-266
438
-265
398
-257
361
-249
325
-240
291
-232
251
-232
4
3
-395
26
-405
39
-419
53
-424
69
-423
84
-421
98
-405
119
4
4
234
-279
216
-288
199
-297
170
-297
141
-299
116
-301
110
-304
5
0
-216
-218
-218
-214
-214
-210
-217
5
1
359
26
356
31
357
46
355
47
353
46
352
44
351
44
5
2
262
139
264
148
261
150
253
150
245
154
237
157
222
172
5
3
-42
-139
-59
-152
-74
-151
-93
-154
-109
-153
-122
-152
-131
-134
5
4
-160
-91
-159
-83
-162
-78
-164
-75
-165
-69
-167
-64
-169
-40
5
5
-56
83
-49
88
-48
92
-46
95
-36
97
-26
99
-12
107
6
0
43
45
48
53
61
66
72
6
1
64
-12
66
-13
66
-15
65
-16
65
-16
64
-16
68
-17
6
2
15
100
28
99
42
93
51
88
59
82
65
77
74
64
6
3
-212
72
-198
75
-192
71
-185
69
-178
69
-172
67
-161
65
6
4
2
-37
1
-41
4
-43
4
-48
3
-52
2
-57
-5
-61
6
5
3
-6
6
-4
14
-2
16
-1
18
1
17
4
17
1
6
6
-112
1
-111
11
-108
17
-102
21
-96
24
-94
28
-91
44
7
0
72
71
72
74
77
78
79
7
1
-57
-70
-56
-77
-59
-82
-62
-83
-64
-80
-67
-77
-74
-65
7
2
1
-27
1
-26
2
-27
3
-27
2
-26
1
-25
0
-24
7
3
14
-4
16
-5
21
-5
24
-2
26
0
29
3
33
6
7
4
-22
8
-14
10
-12
16
-6
20
-1
21
4
22
9
24
7
5
-2
23
0
22
1
18
4
17
5
17
8
16
7
15
7
6
13
-23
12
-23
11
-23
10
-23
9
-23
10
-23
8
-25
7
7
-2
-11
-5
-12
-2
-10
0
-7
0
-4
-2
-3
-2
-6
8
0
14
14
18
21
23
24
25
8
1
6
7
6
6
6
7
6
8
5
10
4
12
6
12
8
2
-2
-15
-1
-16
0
-18
0
-19
-1
-19
-1
-20
-9
-22
8
3
-13
6
-12
4
-11
4
-11
5
-10
6
-9
7
-8
8
8
4
-3
-17
-8
-19
-7
-22
-9
-23
-12
-22
-14
-21
-17
-21
8
5
5
6
4
6
4
9
4
11
3
12
4
12
9
15
8
6
0
21
0
18
3
16
4
14
4
12
5
10
7
9
8
7
11
-6
10
-10
6
-13
4
-15
2
-16
0
-17
-8
-16
8
8
3
-16
1
-17
-1
-15
-4
-11
-6
-10
-7
-10
-7
-3
9
0
8
7
5
5
4
4
5
9
1
10
-21
10
-21
10
-21
10
-21
9
-20
9
-19
9
-20
9
2
2
16
2
16
1
16
1
15
1
15
1
15
3
13
9
3
-12
6
-12
7
-12
9
-12
9
-12
11
-12
11
-8
12
9
4
10
-4
10
-4
9
-5
9
-6
9
-7
9
-7
6
-6
9
5
-1
-5
-1
-5
-3
-6
-3
-6
-4
-7
-4
-7
-9
-8
9
6
0
10
-1
10
-1
9
-1
9
-2
9
-2
9
-2
9
9
7
3
11
4
11
7
10
7
9
7
8
7
7
9
4
9
8
1
-2
1
-3
2
-6
1
-7
1
-7
0
-8
-4
-8
9
9
-1
1
-2
1
-5
2
-5
2
-6
2
-6
1
-8
5
10
0
-3
-3
-4
-4
-3
-3
-2
10
1
-3
1
-3
1
-4
1
-4
1
-4
2
-4
2
-6
1
10
2
2
1
2
1
2
0
3
0
2
1
2
1
2
0
10
3
-5
3
-5
3
-5
3
-5
3
-5
3
-5
3
-3
4
10
4
-1
4
-2
4
-2
6
-2
6
-2
6
-2
6
0
5
10
5
6
-4
5
-4
5
-4
5
-4
4
-4
4
-4
4
-6
10
6
4
0
4
-1
3
0
3
0
3
0
3
0
1
-1
10
7
1
-1
1
-1
1
-1
1
-1
1
-2
1
-2
2
-3
10
8
0
3
0
3
2
4
2
4
3
3
3
3
4
0
10
9
3
1
3
1
3
0
3
0
3
-1
3
-1
0
-2
10
10
-1
-4
-1
-5
0
-6
0
-6
0
-6
0
-6
-1
-8

 

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