A major dip in the Earth’s magnetic field over the South Atlantic has been puzzling scientists for over a century.
Perhaps most strangely, the weak spot — dubbed the South Atlantic Anomaly — has grown rapidly over the last eleven years….

A major dip in the Earth’s magnetic field over the South Atlantic has been puzzling scientists for over a century.
Perhaps most strangely, the weak spot — dubbed the South Atlantic Anomaly — has grown rapidly over the last eleven years….