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Index/Locations/South Atlantic Anomaly

South Atlantic Anomaly

Area in South Atlantic where the Earth's magnetic field is weakest relative to an idealized dipole, so that the inner Van Allen radiation belt comes closest to the Earth's surface (altitude 200 km), exposing satellites to higher-than-usual radiation

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Nov 26, 2025
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How long does a magnetic pole reversal take and what signs precede one?

Geoscience literature and agency reporting show that geomagnetic reversals are slow, messy events taking from about a few hundred years in short excursions up to several thousand — most commonly quote...