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