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

Earth’s satellites-die-as-arth-s-magnetic-shield-weakens'>magnetic shield is shifting in dramatic ways. New data from ESA’s Swarm satellites show that the South Atlantic Anomaly — a vast weak spot in Earth’s magnetic field — has grown by nearly half the size of continental Europe since 2014. Even more striking, a region southwest of Africa has begun weakening even faster in recent years, hinting at unusual activity deep within Earth’s molten outer core.

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