Geophysical Journal | 2016 volume 38 6

Dynamics of secular variations of geomagnetic field in the course of time

© Yu.P. Sumaruk, T.P. Sumaruk, Ya. Reda, 2016

Time changes of the geomagnetic field secular variations, cleaned by three and eleven years running means were studying. The years of the changes of sign secular variations and years of the changes of their velocity were found. It was shown that these years are observed at the solar activity extremeness and the secular variations j erks coincide with these years also. It made conclusion that jarks have great component due external sources.

Key words: secular variations, jerks, solar activity, geomagnetic activity, Wolf numbers, magne- tospheric and ionospheric sources, fulcrum years.