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I came across the information that on November 11/12 we will receive a very strong dose of coronal ejection from the sun. Do you turn off your devices or there is nothing to be afraid of?
I leave them all on...
Kp6 is moderate, that is no big deal. Even during Kp9 storms I left everything on. It's more of a problem for long high voltage transmission lines, rather than the 110/230V grid.
Is it really November 11/12? I'm suprised that one can predict such things that far and precise in advance...
Maybe I have overseen something, but I didn't find anything related on the linked website.
Anyway, as long as there are no official warnings over public news, I wouldn't turn off any devices for that reason.