USGS Geomagnetism Program data are made available as-is and without any guarantees of continuity and quality.
To view geomagnetic data use Geomag Plots.
- Questions and discussion related to USGS Geomagnetism program data products and data access. Announcements about new data products, data product updates, and issues with data products.
- Frequent announcements about USGS Geomagnetic observatory related maintenance and disturbances, including planned outages.
- Questions and discussion related to geomagnetic, geoelectric, and space hazards research. Announcements about new research papers, presentations and public outreach from the USGS Geomagnetism Program.
Definitive data, consisting of one-minute, hourly-mean, and daily-mean values from USGS observatories from the year 1985 onward are available online. Intermagnet has definitive data available for download, including USGS data. The most recent definitive data typically becomes available within a year of the end of the previous calendar year. USGS currently has an interactive data downloader in beta testing, which will provide download for USGS preliminary and definitive data directly from USGS.
Publications making use of our data should include an acknowledgment statement such as the following:
The results presented in this document rely on data collected at magnetic observatories operated by the U.S. Geological Survey (USGS, geomag.usgs.gov).
USGS Geomagnetism Program Data, Inquiries and Specialized Data Requests
Data Management: Software Developer
Other Sources of Data
- Alternate Sources of Geomagnetic Data
- Intermagnet | Intermagnet Open-Access FTP Data Site
- National Centers for Environmental Information (formerly NGDC)
- National Space Science Data Center (NASA)
- World Data Center Copenhagen
- World Data Center Edinburgh
- World Data Center Kyoto
- World Data Center Mumbi
- Satellite Programs
- Defense Meteorological Satellite Program
- The Ørsted Satellite
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Carol A. Finn
Geomagnetism Group Leader