Earth’s Magnetic Field Today (Nov. 11, 2025): Equatorial Polarity Twist, South Atlantic Anomaly Expands, and NOAA Issues G2–G3 Geomagnetic Storm Watches
NOAA issued geomagnetic storm watches for Nov. 11–13 as multiple coronal mass ejections approach Earth, with G2 conditions expected today and G3 on Nov. 12. ESA Swarm data show the South Atlantic Anomaly’s weakest region has expanded by 0.9% of Earth’s surface since 2014, shifting toward Africa. New research finds the magnetosphere’s electric polarity reverses near the equator, challenging previous models.