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South Atlantic Anomaly Expands, Threatening Satellites and Safety

11/14/2025

Summary

Anomaly Expands Risks

The South Atlantic Anomaly has expanded significantly since 2014 and now covers nearly half the size of continental Europe.
Its weak magnetic field heightens solar radiation exposure, risking satellites and astronauts.
Recent studies indicate the SAA is evolving, with geomagnetic changes linked to Earth's molten outer core dynamics.
As the anomaly grows, satellite-reliant industries such as telecommunications and defense must invest in more resilient systems to cope with these shifts.

Summary

Scientists Discover Magnetosphere Reversal

Kyoto University, Nagoya University, and Kyushu University scientists found that near the equator, the magnetosphere's morning side is negative while the evening side is positive.
The reversal arises from plasma moving along magnetic field lines.
The findings were published in the Journal of Geophysical Research: Space Physics.
The study improves understanding of space electric forces and supports better forecasts of disturbances that can affect satellites and communications.

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Anomaly Expands Risks

The South Atlantic Anomaly has expanded significantly since 2014 and now covers nearly half the size of continental Europe.
Its weak magnetic field heightens solar radiation exposure, risking satellites and astronauts.
Recent studies indicate the SAA is evolving, with geomagnetic changes linked to Earth's molten outer core dynamics.
As the anomaly grows, satellite-reliant industries such as telecommunications and defense must invest in more resilient systems to cope with these shifts.

1 / 2