| Abstract |
The Earth's magnetic field (geomagnetic field) generated in the geodynamo process in the core has continuously changed. It has various time scales in the changes named as "geomagnetic secular variation (GSV)", from several years to a billion years. We are interested in the GSV with decadal-to-millennium period. Organized human observation of geomagnetic field has been executed since the 16C, but older information should be derived mainly from paleomagnetic measurements. The most reliable paleomagnetic data are done for the archeological relics (archeomagnetism). Here I introduce the feature of the GSV and the new archeomagnetic database in Japan we produced. |
