Many times before, or so say the rocks.Originally posted by Uncle Bob:
Well, the magnetic North Pole has been wandering around a lot in the last couple of decades. Enough that many military maps can't be used with precision without corrections. If the poles flip we lose the Van Allen belts temporarily. The Solar Wind won't peal off the atmosphere very fast, but it will fry all the commo/GPS satellites and make cave living popular.
It has happened before.