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Aurora alert! Butterfly-shaped 'hole' in sun's atmosphere could spark geomagnetic storm Sept. 13-14

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A colossal butterfly-shaped coronal hole has opened in the sun's atmosphere and is currently spewing a fast-moving stream of solar wind toward Earth that could trigger a moderate geomagnetic storm and dazzling auroras this weekend.

 

The high-speed solar wind from this striking feature, spanning some 310,000 miles (500,000 kilometers) across, is expected to reach Earth around Sept. 14.

 

image.jpeg.77a514b7803db314472ba91f146c7b78.jpeg

The SOHO overview of the sun on Sept. 13, 2025. (Image credit: NASA)

 

 

Space weather forecasters anticipate active to G1 (minor) geomagnetic storm conditions with a possibility of G2 (moderate) geomagnetic storm levels being reached between Sept. 13 and 14, according to the U.K. Met Office. NOAA's Space Weather Prediction Center has issued a slightly more cautious estimate, anticipating peaks of only G1 conditions. But the potential for stronger activity remains if the solar wind's embedded magnetic field lines up favorably with Earth's.

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