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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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