Spaceweather.

INTERPLANETARY SHOCK WAVE SPARKS COLORFUL AURORAS: This was not in the forecast. An unexpected interplanetary shock wave hit Earth's magnetic field on Feb. 11th. The impact sparked a G1-class geomagnetic storm and some very colorful auroras inside the Arctic Circle:

The shock wave was a small one and may have been a faint CME that escaped detection when it left the sun some days ago. This will happen increasingly often as Solar Cycle 25 intensifies. The sun is puffing out CMEs, hurling them in all directions, and some will inevitably slip through cracks in the forecast.


Graham (G4FUJ)

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