The South Atlantic Anomaly May Go Back Far Longer Than Anybody Knew

https://www.sciencealert.com/the-mysterious-magnetic-anomaly-in-the-south-atlantic-existed-millions-of-years-ago

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.

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