Magnetic North, Geomagnetic and Magnetic Poles
If we rotate a compass for southern hemisphere in Japan... (MPG:2.3MB)
Animation of geomagnetic secular variation for the last 400 years.
International Geomagnetic Reference Field (IGRF)   Model field at a point   Geomagnetic Elements
Geomagnetic field observation and Collection of the data
(Geomagnetic observatories on the Google Earth)
Pamphlet of our Center
Geomagnetic Field Frequently Asked Questions by NGDC, USA.
Link to The Great Magnet, the Earth by David P. Stern
Link to The Exploration of the Earth's Magnetosphere by David P. Stern and Mauricio Peredo