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Magnetic Uncertainty

WMM Report

Geomagnetic Observatories

BGS operate nine magnetic observatories.Three in the UK and six overseas.

Magnetic uncertainty

A new paper estimates how accurate magnetic values of the IGRF are on average across the globe.

State of the magnetic field

A new report, authored by NOAA-NCEI and BGS, describes the performance of the World Magnetic Model (WMM) 2020 predictions against recent models.

About BGS Geomagnetism

The Geomagnetism team measures, records, models and interprets variations in the Earth’s natural magnetic fields.

Our data and expertise help to develop scientific understanding of change in the Earth and the environment, from deep within the core out into space.

We also provide geomagnetic products and services to industry and to academic colleagues and we use our knowledge for information and education.

Video introduction


Modelling the Earth's magnetic field, space weather hazards.


About our magnetic observatory operations, UK surveying, equipment.

Data and Services

Observatory data, indices, models, charts, applications.


Overviews of the Earth's magnetic field, reversals, magnetic poles.

Global activity now!

Find out what the current global geomagnetic activity level is.