South Atlantic Anomaly
Vast Anomaly in Earth's Magnetic Field Keeps Growing, Satellites Reveal Science Alert - October 14, 2025
A giant dent in Earth's magnetic field is continuing to expand, according to the latest data from a trio of satellites monitoring our world. It's called the South Atlantic Anomaly, stretching across the gulf that separates Africa from South America, and the latest data suggests that it has expanded by roughly half the size of continental Europe since 2014, while its magnetic intensity weakens.
South Atlantic Anomaly

For years, scientists have been gripped by the existence of a strange anomaly weakening Earth's magnetic field. It's located in the midst of the South Atlantic ocean, extending all the way from South America to the west coast of southern Africa. This giant, puzzling expanse of reduced magnetic intensity - which in recent times looks to be splitting into two divided entities - means the region offers less protection against harmful radiation from the Sun for Earth's satellites. That's a problem for spacecraft today. But perhaps the greatest significance of the South Atlantic Anomaly is what it might mean for tomorrow: specifically, whether the mysterious phenomenon foreshadows the beginnings of a complete polar reversal of Earth's magnetic field. Such giant magnetic flips have occurred many times in our planet's history, and some scientists have speculated that the South Atlantic Anomaly could be a kind of precursor to these rare global transitions.

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