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Illustration of the dynamo mechanism that generates the Earth's magnetic field: convection currents of fluid metal in the Earth's outer core, driven by heat flow from the inner core, organized into rolls by the Coriolis force, generate circulating electric currents, which supports the magnetic field. Credit: Andrew Z. Colvin/wikipedia

Geodynamo Theory: How Earth’s Core Creates the Magnetic Field

March 27, 2026

The South Atlantic Anomaly — a growing weak spot in Earth’s magnetic shield — has expanded by nearly half the size of continental Europe since 2014, with especially intense weakening now occurring near Africa. At the same time, magnetic strength is rising over Siberia and fading over Canada, reflecting powerful changes unfolding deep inside Earth’s core. Credit: ESA (Data source: Finlay, C.C. et al., 2025)

A giant weak spot in Earth’s magnetic field is now half the size of Europe

Earth

New simulation method sharpens our view into Earth’s interior

Brick dates to the reign of Nebuchadnezzar II (ca. 604 to 562 BCE) based on the interpretation of the inscription. This object was looted from its original context before being acquired by the Slemani Museum and stored in that museum with agreement from the central government. Image courtesy of the Slemani Museum

Mesopotamian bricks unveil the strength of Earth’s ancient magnetic field

Earth

Activity deep in Earth affects the global magnetic field

Nuclear magnetic resonance experiments using Earth’s magnetic field

August 20, 2014

Could Pulses in Earth’s Magnetic Field Forecast Earthquakes?

June 21, 2014

Swarm reveals Earth’s changing magnetism

June 20, 2014

Solar wind breaks through Earth’s magnetic field

June 9, 2014

Earth’s magnetic field is important for climate change at high altitudes

May 26, 2014

Magnetic anomaly deep within Earth’s crust reveals Africa in North America

April 3, 2014

Satellite Trio to Explore the Earth’s Magnetic Field

November 23, 2013

Flying Through a Geomagnetic Storm

March 14, 2012

Ground-based lasers vie with satellites to map Earth’s magnetic field

September 15, 2011

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