CORONAL MASS EJECTIONCME

Coronal mass ejection toward Earth, September 28, 2026

Arrival forecast
Map: Coronal mass ejection toward Earth, September 28, 2026

A coronal mass ejection, a billion-ton cloud of magnetized gas, left the Sun on September 28, 2026 at 14:36 UTC, moving at about 447 km/s (1.0 million mph). NASA’s model forecast it to reach Earth around Friday, October 2 at 02:39 UTC. In the model’s strongest scenario it pushes the K index to 4, below storm level.

Left the SunSep 28 14:36 UTC
Speed447 km/s
Arrival (model)Oct 2 02:39 UTC
Glancing blowNo
Kp forecastup to 4
Travel time84 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?

Sunspots. Sunspots are cooler, darker regions of the Sun with intense magnetic fields. Most solar flares erupt near them.

Data: NASA DONKI (WSA-ENLIL model).

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