Surprise Coronal Mass Ejection From Dec. 8 X1.1 Flare Triggers Geomagnetic Storms

Scientists at Russia’s IKI say the arrival was absent from propagation models, limiting any long‑term forecast.

Overview

The second of two plasma clouds from December 7–8 suddenly appeared near Earth and struck the planet.
The Solar Astronomy Laboratory reported that geomagnetic storms began at about 01:40 MSK following the impact.
The ejected cloud was linked to an X1.1 solar flare recorded around 08:00 MSK on December 8.
Initial assessments indicate Earth was hit by the cloud’s edge, so strong storms are not expected.
Researchers are continuing observations as December solar activity has been unusually unpredictable.