Quote:
Uncle Erik said:
A worldwide EMP would be devestating, but the article makes it sound more like a possibility than a probability.
Pretty much. A major coronal mass ejection that severely disrupts electronics on Earth is a possibility at any time, though more probable when solar activity is at its peak every 11 or so years. There's nothing that suggests that this cycle will be any more likely to produce a planet disrupting event than previous cycles.
Quote:
So even if your gear isn't plugged in it's going to pretty much own everything?
Maybe. No one's really sure, though government war gaming on the effects of an EMP attack indicates that power and communications will be out for anywhere between a few days and a few months, and food/fuel distribution would get a bit touchy for a while due to lack of comms.
Mechanism of damage is the change in the Earth's magnetic field will induce an electric field on the Earth's surface. That creates a voltage differential across any conductors in the electric field. The longer the conductor, the larger the voltage differential between the ends.
Ex: PCB traces in iPod are short, differential will be small. Power lines are very long, differential will be very large. If the voltage differential is too high for the electronic device to survive, it stops working correctly.
Ex: iPod = low tolerance. Power station = high tolerance.
Tube gear is lucky in this respect. Most of the wiring is short, and tubes can take much higher voltage differentials before they go poof. Course, just some spare tubes around in a metal container and you don't even have to worry about that.
Cars are also lucky in this respect. They're basically giant rolling Faraday cages and are mostly immune to even high strength (50kV/m) EM fields when not running. Not as great when running, but most will restart and function fine.