Earth's magnetic field just struggled with a weak CME: Sign of the times -- Earth Changes -- Sott.net

On May 12, a
weak Coronal Mass Ejection (CME) released from the Sun hit Earth. The event was supposed to pass by uneventfully — it would perhaps spark a few auroras, but nothing more. So how did a strong G3 geomagnetic storm ensue?
Nobody was expecting a level 3 event from this CME.
Nobody saw the KP Index hitting 7.
© spaceweathernews.comAnd when I say nobody, I mean nobody predicted this: not NASA, NOAA, ESA or IPS in Australia.
The CME's speed peaked at just 500 km/s (purple line below).
This is a little stronger than your standard solar wind, but weak in terms of a Coronal Mass Ejection.

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