Special features of secular variations of geomagnetic field in the northern polar area of the Earth
Sumaruk Yu.P., Sumaruk P.V.
Secular variations of the geomagnetic field on the data of 13 high latitude magnetic observatories at north polar cap are investigated.
Secular variations from internal and external sources are selected. It is shown that solar and geomagnetic activities have to a great
extent influence for secular variations of different periods.