An engineer would describe lightning as an impulse. An impulse theoretically has infinite magnitude but zero duration. You can only have a true impulse in mathematical terms, but a lightning bolt is close enough. One of the characteristics of an impulse is that it contains all frequencies from zero to infinity. That's why lightning interferes with radios (particularly AM radios that operate at low frequencies): the impulse generates rf energy across all broadcast bands.
Now, technically, lightning does not alternate: it travels in one direction only. But the rapid change of current is effectively high frequency because it has a very high rate of change.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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