INTERMAGNET is an international program to provide quality controlled geomagnetic observatory data through a website and an ftp-server. Both archive and near-real time data are provided. You can find more information on GFZ's contribution to the INTERMAGNET cooperation here.

The World Data Centre for Geomagnetism (Edinburgh) is giving access to definitive minute means, hourly means and annual means of geomagnetic observatories and is part of the World Data System established by International Council for Sciences (ICSU).

SuperMAG provides observatory data and time series from magnetometer stations as well as tools for data treatment and analysis.

Observatory Niemegk publishes Monthly Reports with details on magnetic activity and the occurrence of rapid geomagnetic variations like sudden storm commencements, solar flare effects and bay disturbances.