A powerful G4 geomagnetic storm is approaching Earth after a massive coronal mass ejection (CME) erupted from the sun on Sunday, expected to arrive within the next 24 hours. NOAA’s Space Weather Prediction Center and the UK Met Office forecast strong G3 to severe G4 conditions, potentially making northern lights visible as far south as Alabama and northern California.
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The stunning aurora displays occur when high-energy solar particles from the CME slam into Earth’s upper atmosphere, colliding with oxygen and nitrogen atoms. These collisions excite the atoms, causing them to emit vibrant greens, purples, and reds across the night sky. Visibility depends on the CME’s magnetic orientation, arrival speed, and local cloud cover, with optimal viewing between 10 p.m. and 4 a.m. local time from the darkest locations possible.
G4 Geomagnetic Storm Impacts on Infrastructure:
Rated 4 out of 5 on NOAA’s geomagnetic storm scale, a G4 event poses serious risks including widespread voltage control problems across power grids, increased satellite navigation errors (GPS), low-frequency radio blackouts, and spacecraft surface charging issues. Even G3 storms require voltage corrections and cause intermittent navigation/radio disruptions.
Solar Maximum Fuels Intense Activity:
This storm coincides with the sun’s solar maximum phase reached in October 2024 during its 11-year cycle. Intense sunspot activity will continue producing strong solar flares and CMEs through 2026, creating more frequent aurora opportunities alongside infrastructure challenges. NOAA continues real-time CME analysis for precise impact predictions.
