Annual means, Tromsø Geophysical Observatory
IAGA code: TRO Geographic latitude: 69° 39',7 N Altitude: 105 m
Country: NO Geographic longitude: 18° 56',4 E Elements measured: D,H,Z until 2005. Then D, I, F
Year D (° ') D (°) H (nT) Z (nT) I (° ') I (°) F(nT) X (nT) Y(nT) Notes
1930 -4 07.7 -4.128 11567 99999 99 99.9 99.999 99999 11537 -833 Z not measured
1931 -3 59.6 -3.993 11548 50198 77 02.7 77.045 51509 11520 -804
1932 -3 49.0 -3.817 11499 50195 77 05.8 77.097 51495 11473 -765
1933 -3 37.3 -3.622 11472 50203 77 07.7 77.128 51497 11449 -725
1934 -3 25.9 -3.432 11441 50223 77 10.0 77.167 51510 11420 -685
1935 -3 14.3 -3.238 11407 50247 77 12.6 77.210 51526 11389 -644
1936 -3 04.8 -3.080 11379 50276 77 14.8 77.247 51548 11363 -611
1937 -2 53.7 -2.895 11350 50308 77 17.2 77.286 51572 11336 -573
1938 -2 44.1 -2.735 11325 50340 77 19.3 77.321 51598 11312 -540
1939 -2 35.0 -2.583 11297 50362 77 21.4 77.357 51613 11286 -509
1940 -2 26.6 -2.443 11278 50381 77 22.9 77.382 51628 11268 -481
1941 -2 16.6 -2.277 11256 50417 77 24.9 77.415 51658 11247 -447
1942 -2 10.6 -2.177 11244 50424 77 25.8 77.429 51662 11236 -427
1943 -2 02.5 -2.042 11222 50449 77 27.6 77.459 51682 11215 -400
1944 -1 54.3 -1.905 11213 50467 77 28.4 77.473 51698 11207 -373
1945 -1 45.7 -1.762 11199 50503 77 29.8 77.497 51730 11194 -344
1946 -1 34.6 -1.577 11179 50554 77 31.9 77.531 51775 11175 -308
1947 -1 26.5 -1.442 11174 50585 77 32.6 77.544 51804 11170 -281
1948 -1 18.4 -1.307 11156 50594 77 33.9 77.565 51809 11153 -254
1949 -1 10.5 -1.175 11153 50612 77 34.4 77.573 51826 11151 -229
1950 -1 03.6 -1.060 11152 50647 77 34.9 77.582 51860 11150 -206
1951 -0 54.1 -0.902 11143 50693 77 36.2 77.603 51903 11142 -175
1952 -0 43.9 -0.732 11144 50711 77 36.4 77.606 51921 11143 -142
1953 -0 36.0 -0.600 11153 50724 77 36.0 77.599 51936 11152 -117
1954 -0 29.1 -0.485 11165 50744 77 35.5 77.591 51958 11165 -95
1955 -0 24.0 -0.400 11172 50778 77 35.5 77.592 51992 11172 -78
1956 -0 18.1 -0.302 11173 50825 77 36.1 77.602 52039 11173 -59
1957 -0 15.9 -0.265 11182 50868 77 36.1 77.602 52083 11182 -52
1958 -0 12.7 -0.212 11194 50902 77 35.8 77.597 52118 11194 -41
1959 -0 08.1 -0.135 11196 50935 77 36.2 77.603 52151 11196 -26
1960 -0 04.3 -0.072 11197 50980 77 36.8 77.613 52195 11197 -14
1961 -0 02.1 -0.035 11214 51004 77 36.0 77.600 52222 11214 -7
1962 0 00.2 0.003 11217 51035 77 36.2 77.604 52253 11217 1
1963 0 03.9 0.065 11222 51065 77 36.3 77.606 52284 11222 13
1964 0 03.7 0.062 11239 51088 77 35.6 77.593 52310 11239 12
1965 0 04.6 0.077 11251 51094 77 34.9 77.582 52318 11251 15
1966 0 04.5 0.075 11260 51130 77 34.8 77.580 52355 11260 15
1967 0 04.0 0.067 11265 51160 77 34.9 77.582 52386 11265 13
1968 0 02.0 0.033 11268 51196 77 35.2 77.587 52421 11268 7
1969 -0 01.5 -0.025 11279 51235 77 35.1 77.585 52462 11279 -5
1970 -0 04.2 -0.070 11295 51278 77 34.7 77.578 52507 11295 -14
1971 -0 05.5 -0.092 11333 51303 77 32.6 77.543 52540 11333 -18
1972 -0 05.5 -0.092 11364 51319 77 30.8 77.514 52562 11364 -18
1973 -0 03.5 -0.058 11370 51365 77 31.1 77.518 52608 11370 -12
1974 0 00.3 0.005 11373 51415 77 31.6 77.527 52658 11373 1
1975 0 02.4 0.040 11384 51446 77 31.4 77.523 52690 11384 8
1976 0 07.0 0.117 11394 51466 77 31.0 77.517 52712 11394 23
1977 0 12.0 0.200 11396 51497 77 31.3 77.522 52743 11396 40
1978 0 19.8 0.330 11385 51540 77 32.6 77.544 52782 11385 66
1979 0 26.3 0.438 11382 51559 77 33.1 77.551 52800 11382 87
1980 0 32.1 0.535 11373 51561 77 33.7 77.561 52800 11373 106
1981 0 38.8 0.647 11353 51586 77 35.3 77.588 52821 11352 128
1982 0 46.9 0.782 11324 51598 77 37.3 77.622 52826 11323 154
1983 0 52.6 0.877 11305 51593 77 38.4 77.641 52817 11304 173
1984 0 59.7 0.995 11275 51591 77 40.3 77.672 52809 11273 196
1985 1 05.2 1.087 11254 51584 77 41.6 77.693 52797 11252 213
1986 1 11.5 1.192 11225 51590 77 43.5 77.725 52797 11223 233
1987 1 17.6 1.293 11213 51610 77 44.5 77.742 52814 11210 253
1988 1 23.2 1.387 11187 51597 77 46.0 77.767 52796 11184 271
1989 1 27.9 1.465 11161 51623 77 48.0 77.800 52816 11157 285
1990 1 32.7 1.545 11146 51624 77 49.0 77.816 52814 11142 301
1991 1 38.6 1.643 11126 51636 77 50.4 77.840 52821 11121 319
1992 1 44.1 1.735 11111 51641 77 51.4 77.857 52823 11106 336
1993 1 52.2 1.870 11098 51644 77 52.3 77.872 52823 11092 362
1994 2 02.6 2.043 11075 51664 77 54.1 77.901 52838 11068 395
1995 2 10.0 2.167 11073 51677 77 54.4 77.906 52850 11065 419
1996 2 19.8 2.330 11067 51694 77 55.0 77.916 52865 11058 450
1997 2 30.9 2.515 11061 51723 77 55.7 77.929 52892 11050 485
1998 2 42.2 2.703 11047 51766 77 57.2 77.954 52932 11035 521
1999 2 52.4 2.873 11038 51802 77 58.3 77.971 52965 11024 553
2000 3 02.9 3.048 11036.0 51848.7 77 59.0 77.984 53010.2 11020.4 586.9
2001 3 13.7 3.228 11034.1 51884.1 77 59.6 77.994 53044.4 11016.6 621.4
2002 3 25.4 3.423 11029.8 51928.3 78 00.5 78.008 53086.8 11010.1 658.6
2003 3 38.6 3.643 11012.7 51982.5 78 02.3 78.039 53136.2 10990.4 699.8
2004 3 48.5 3.808 11013.1 52007.1 78 02.6 78.044 53160.4 10988.8 731.5
2005 3 58.6 3.977 11004.0 52039.1 78 03.6 78.060 53189.8 10977.5 763.1
Jump 31.12.2005 2400 UT: D: +0 02.3, H: -66.3, Z: +25.5
2006 4 10.9 4.182 10941.8 52087.5 78 08.2 78.137 53224.3 10912.7 797.9
2007 4 21.3 4.355 10941.6 52119.6 78 08.6 78.144 53255.7 10910.0 830.9
2008 4 33.2 4.553 10938.1 52149.9 78 09.3 78.154 53284.7 10903.6 868.3
2009 4 44.9 4.748 10940.1 52177.9 78 09.5 78.158 53312.5 10902.6 905.6
2010 4 59.0 4.982 10927.3 52213.7 78 10.8 78.180 53344.9 10886.0 948.9
2011 5 13.1 5.219 10915.2 52250.7 78 12.0 78.201 53378.7 10869.9 992.7
2012 5 29.1 5.485 10902.0 52285.6 78 13.3 78.222 53410.2 10852.1 1041.9
2013 5 43.2 5.721 10899.7 52321.7 78 14.0 78.232 53444.9 10843.6 1104.5
2014 5 57.5 5.941 10889.6 52343.9 78 14.9 78.248 53464.7 10831.1 1126.9
2015 6 10.8 6.179 10872.9 52386.3 78 16.5 78.275 53502.9 10809.6 1170.1
2016 6 24.7 6.411 10861.9 52414.3 78 17.5 78.292 53528.0 10793.9 1212.5
2017 6 40.3 6.671 10850.9 52455.8 78 18.8 78.313 53566.4 10777.4 1260.3