CORONAL MASS EJECTIONCME

Coronal mass ejection toward Earth, September 14, 2026

Arrival forecast
Map: Coronal mass ejection toward Earth, September 14, 2026

A coronal mass ejection, a billion-ton cloud of magnetized gas, left the Sun on September 14, 2026 at 11:08 UTC, moving at about 744 km/s (1.7 million mph). NASA’s model forecast it to deliver a glancing blow to Earth around Thursday, September 17 at 06:00 UTC. In the model’s strongest scenario it pushes the K index to 4, below storm level.

Left the SunSep 14 11:08 UTC
Speed744 km/s
Arrival (model)Sep 17 06:00 UTC
Glancing blowYes
Kp forecastup to 4
Travel time67 hours
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What happens when it arrives

If the cloud’s magnetic field points south when it hits, it can couple with Earth’s and set off a geomagnetic storm: auroras far from the poles, and in strong storms trouble for power grids, satellites and GPS. Arrival times are model forecasts and are often off by six hours or more. Live outlook: aurora forecast.

Did you know?

What is a CME?. A coronal mass ejection is a huge cloud of magnetized gas thrown off by the Sun. When one hits Earth, it can trigger a geomagnetic storm.

Data: NASA DONKI (WSA-ENLIL model).

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