Coronal Mass Ejection Passing over Earth: Geomagnetic Storm Continues | NOAA

Coronal Mass Ejection Passing over Earth: Geomagnetic Storm Continues | NOAA

A G4 (severe) Spaceweather Watch has been posted for November 12, 2025, by the U.S. National Oceanic and Atmospheric Administration (NOAA). Coronal mass ejection (CME) passage continues and G4 (severe) storm levels are expected to continue to occur throughout the overnight. Coronal mass ejections are huge bubbles of gas threaded with magnetic field lines that are ejected from the Sun over the course of several hours.

Follow http://spaceweather.gov for the latest updates. Key critical infrastructure operators have been notified to mitigate any potential effects.

G4 (severe) storm levels were reached on November 12, 2025, at 0120 UTC (8:20pm EST on Nov. 11)! Geomagnetic storm conditions are anticipated to continue into the night. The included images are of aurora shining over northeastern Colorado.

Yesterday's X5-class solar flare from sunspot 4274 hurled a fuisillade of energetic protons toward Earth. Particles are so powerful, they are penetrating the atmosphere all the way to the ground. "This is a very significant event," says Professor Clive Dyer of the Surrey Space Centre. "Neutron monitors around the world are detecting it."

This is called a Ground Level Event (GLE). GLEs of this magnitude are rare; they happen only once or twice every solar cycle. "This one is comparable to the GLE of Dec. 13, 2006," says Dyer. That makes it a ~20-year event.

Credit: National Oceanic and Atmospheric Administration (NOAA)

Release Date: Nov. 12, 2025

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