Japanese Seculare variation of geomagnetic dipole moment

Selection

Magnetic North, geomagnetic anf Magnetic Poles

Geomagnetic dipole moment in the past for 180 years.
The coefficients since 1900 are by IGRF and before then by Rikitake, T. "Electromagnetism and the Earth's Interior", Elsevier Pub. Co., 1966.