Questionaire for a paper Im writing

[Tarrel]

No, not just the infrastructure like traffic lights. There is a point of view that a severe geomagnetic storm would fry delicate, stand-alone circuits in things such as PC's, radios, car ignition systems, etc. These would be rendered inoperative until the damaged circuits were replaced or repaired. They don't have to be connected to the grid in order to be damaged. The general prevention reinserted to this is to put such circuits (or spares thereof) in a "Faraday Cage", essentially a closed metal box. The name comes from Faraday's law; "The net charge inside a charged body is zero".

AIUI, this is an accepted effect of a nuclear blast (presumably researched during nuclear tests?), but it remains pretty much an unknown in the case of a severe geomagnetic storm, since we haven't experienced anything of sufficient magnitude since the Carrington Event (1857?).

Having said that, years ago I worked in a major car manufacturer's technical department. They had a vexing problem with one of their models. There was a particular stretch of road in the Midlands where that particular model would just stop in the middle of the road. It was one with an early form of Electronic Engine Management. They eventually traced the problem to a misaligned microwave communications dish, that was over spilling its signal onto the highway!