This catalogue shows our holding of hourly and minute mean data for geomagnetic observatories around the world.
Detailed instructions on how to use the Master Catalogue are available.
Please note - the links to data files on the FTP server no longer open in the frame. Please right-click to open links in a new window, or, if your browser no longer supports FTP, use seperate FTP software to anonymously access ftp.nmh.ac.uk then navigate to wdc/obsdata/1minval or wdc/obsdata/hourval
Data are available in WDC format. If you require a different format please visit our new Data Portal for a range of download options.
Observatory annual means and global magnetic survey data are also available.
Geomagnetic data is also available at these other sites:
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