Secular variation of geomagnetic field in Antarctica
© Yu.P. Sumaruk, T.P. Sumaruk, 2016
The changes of the geomagnetic field secular variations at the Antarctic magnetic observatories for 1956-2010 years were
investigated. The comparison between the secular variations at the Antarctica continent and at north polar cap and adjacent
observatories in the middle latitudes of south hemisphere was performed.
The conclusion was drawn that secular variations at the high latitudes of the Earth have three sources: first - changes of the position
of the central dipole and also changes of the value of its magnetic momentum, second - the changes of the intensities of the
tectonic sources. These sources create the south-African and Antarctic magnetic anomalies? And third - the changes of
geomagnetic activity depending on the sign of general magnetic field of the Sun, and correspondently, on the sign of the
vertical component of the interplanetary magnetic field.
Key words: secular variations, magnetic anomalies, geomagnetic activity, general magnetic field of the Sun.
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