US EditionGeomagnetic Storm May Make Northern Lights Visible in U.S. Monday, Tuesday
A rare G4 severe geomagnetic storm from a powerful solar flare may cause widespread aurora visibility across 24 U.S. states, NOAA warns of potential impacts on power and satellites.
- On Jan. 19, 2026, the National Oceanic and Atmospheric Administration's Space Weather Prediction Center said the sun released an X1.9 flare that launched a coronal mass ejection which struck Earth, prompting a severe geomagnetic storm watch for late Monday and into Tuesday.
- Because Bz briefly dipped south then turned north, solar wind energy entered Earth's magnetosphere but was sharply limited later, constraining auroral visibility.
- NOAA and related indices recorded a G4 geomagnetic storm and Planetary K-index above 8 with an S4 solar radiation storm, forecasters said auroras could be visible as far south as Alabama and California.
- Immediate impacts include potential disruptions to satellites and communications systems and increased radiation for high-altitude aircraft, though astronauts on the International Space Station remain safe; forecasters said conditions should weaken by Tuesday evening but activity may continue into Tuesday night.
- This flare's long duration and full-halo signature mean the X1.9 flare's unusually long duration and full-halo CME suggest increased auroral chances during the November storms and the solar maximum.
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A reddish glow has illuminated the skies of much of the peninsula this morning due to unusual geomagnetic activity that could damage satellites and disrupt communications
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