Geomagnetic field at SOD

Secular variation at Sodankylä Geomagnetic Observatory (SOD) 1914-2024

Declination (2024.5) is 13.48°E. During the observatory history the magnetic north has changed over 13 degrees to eastward.

The year 1944 is incomplete and 1945 missing due to World War II.

Daily geomagnetic activity (Ak)

Daily activity 1914-2024:

Past 3 months activity:

The Ak is daily activity index calculated from the local three hour range K-indecies.