TY JOUR TI Using the Giant Gaussian Process model from paleodirectional and paleointensity data to investigate paleomagnetic secular variation KW Main magnetic field of the Earth KW paleointensity KW paleomagnetic secular variations KW paleodirectional data KW geomagnetic axial dipole model KW Giant Gaussian Process JO Russian Journal of Earth Sciences AU Khokhlov, A.. AU Shcherbakov, V.. AU Lhuillier, F.. PY 2020 IS 20 PB Geophysical Center of the Russian Academy of Sciences