Magnetic North, Geomagnetic and Magnetic Poles
Secular variation of geomagnetic dipole moment
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
(PDF)
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