Sodankylä Geophysical Observatory

Geomagnetic field at SOD

Secular variation at SOD 1914-:

During the observatory history the magnetic north has changed over 12 degrees to eastward.

mag_change_1914-.png The year 1944 is incomplete and 1945 missing due to World War II.

Daily geomagnetic activity (Ak) of the past 3 months:

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

Last modified: 2020-03-11, 14:04:47.