Did you read the article? These solar super storms are a result of the peak of TWO different cycles overlapping.
The last two times this happened were 1859 and 1921. Here's what happened to the crude electronics of 90 years ago:
I did read the article. A period of 22 years for one and 11 years for another. Hence why I asked what happened 11 years ago (the shorter one), as well as 22 years ago (which should have had some period of overlap as well).
Really? I thought it mentioned that solar cycle lengths are based on averages? Because the "11-year cycle" may actually last 9 (or 13, or whatever) years (and similar for the 22-year one), the match up between the two cycles isn't guaranteed every 22 years. In practice it is far rarer. Every decade or so for a strong one, and every 500 years or so for an extreme one (the kind that removes night-time for several days, as happened with the 1859 one).
Oh, and Wals, yeah a Faraday cage would work... IF you unplugged everything from the outside world (and that would be hard to time since you don't know when the CME will happen). :D