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Dataset
Bureau Central de Magnétisme Terrestre
The Bureau Central de Magnétisme Terrestre provides ground-based geomagnetic measurements and related research data.
About Bureau Central de Magnétisme Terrestre
The Bureau Central de Magnétisme Terrestre provides ground-based geomagnetic observations and data products. Its site includes raw magnetic measurements as well as derived data products from these measurements.
It operates the French National Magnetic Observatory in Chambon-la-Forêt, 18 overseas observatories, and 11 repeat stations in metropolitan France. Variation and definitive data can be cited with DOIs. The Lanzhou (LZH) observatory is closed, with recordings paused pending new buildings.
Key features
- Raw ground-based magnetic measurements from observatory network
- Derived data products from magnetic measurements
- Variation data with DOI doi:10.18715/BCMT.MAG.VAR
- Definitive data with DOI doi:10.18715/BCMT.MAG.DEF
- Data from Chambon-la-Forêt, 18 overseas observatories and 11 repeat stations
Best for: Researchers and others who need ground-based geomagnetic measurements from French observatory networks.
Good for
- Provides both raw measurements and derived data products
- Offers DOIs for citation of variation and definitive data
- Covers national observatory, overseas observatories and repeat stations
Watch out for
- Lanzhou (LZH) observatory is closed with recordings paused pending new buildings
Bureau Central de Magnétisme Terrestre at a glance
- Official website
- bcmt.fr
- Category
- Research & Data › Open Data in France
- Type
- Dataset
- Platforms
- Web
- Language
- English
- Country
- FR
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Bureau Central de Magnétisme Terrestre FAQ
How can BCMT variation and definitive data be cited?
Use doi:10.18715/BCMT.MAG.VAR for variation data and doi:10.18715/BCMT.MAG.DEF for definitive data.
Is the Lanzhou observatory still recording?
No. The LZH observatory closed after a light-train line opened in Lanzhou in April 2019, and recordings will resume after new buildings are constructed 120 km away.
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