The data here are updated in near real-time and are kept on this site for several months. For more historic data, visit the Intermagnet website.
Data Types:
If you'd like to download this data at a regular interval we recommend a tool like wget.
Access to the data is provided as-is, without any additional promises to respond quickly to outages, data quality, etc. We request that you acknowledge the USGS Geomagnetism Program in all published documents which make use of our data. Thank you for your interest in the USGS.
The data files use the INTERMAGNET IAGA2002 format. Detailed descriptions of INTERMAGNET formats are available at Intermagnet.org
