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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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