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The latest results from the European Space Agency’s Swarm satellite constellation highlight the dynamic nature of Earth’s magnetism. In the northern hemisphere there are two areas where the magnetic field is particularly strong – one around Canada and the other around Siberia. Since the launch of Swarm in 2013 the Canadian strong field region has decreased while the Siberian strong field region has increased.

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The latest results from the European Space Agency’s Swarm satellite constellation highlight the dynamic nature of Earth’s magnetism. In the northern hemisphere there are two areas where the magnetic field is particularly strong – one around Canada and the other around Siberia. Since the launch of Swarm in 2013 the Canadian strong field region has decreased while the Siberian strong field region has increased.

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Corey S Powell (coreyspowell@mastodon.social)'s status on Tuesday, 21-Oct-2025 13:24:41 JST Corey S Powell
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Something big is happening 3,000 kilometers underground, where Earth's inner ocean of molten, magnetic iron generates the global magnetic field.
The strong parts of the field near the poles are changing, too, getting weaker over Canada and stronger over Siberia.
https://www.esa.int/Applications/Observing_the_Earth/FutureEO/Swarm/Swarm_reveals_growing_weak_spot_in_Earth_s_magnetic_field #science #nature

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