internal and external origins

Secular variations (SV) of the geomagnetic field at the south and north polar caps are investigated for all observations times. It is shown that secular variations are generated by internal and external origins. It is supposed that internal origins are currents on the mantle – core border and also in tectonosphere and external origins – currents in the magnetosphere and ionosphere. Values SV from external origins depend on solar and geomagnetic activities and from internal origins are decreased.