I was just reading a National Geographic article about this.
What If the Biggest Solar Storm on Record Happened Today?
Apparently we are entering a solar cycle similar to the one that cause the 1859 incident, and if we received the same kind of solar flare that hit earth then, the effects could be pretty darned devastating. I'm not going to sit around popping valium and clucking in terror, but it's a valid possibility. If it happens, we'll deal with it... but it won't be pretty.
I read that article and frankly from the way it reads it all sounds like fear mongering to me. In the 1859 solar flare/storm there were northern lights visible to Cuba and the telegraph operators reported sparks from their equipment which in some cases caused fires.. Thats it from a time when the shielding for electronics and safety measures were almost nil. Today we have modern shielding, back up systems and redundancies and the higher tech machinery and electronics they say would be shut down are shielded even more..
No one died that they reported on, and from the way it reads it was business as usual other than the sparks from telegraph equipment and northern lights in the skies.
For the life of me I cannot understand why a magazine like National Geographic would go in for something like this. Its fear mongering for the sake of
selling a magazine...