I did a little googlin' and found that most lightning is a negative charge in a cloud discharging to ground, and that a typical bolt will carry about 40kA, that's 40,000 amps, at a voltage up to 3 million volts per meter of length of the lightning bolt (i.e., one gigavolt for every 1000 feet). That qualifies as current in my book.
Couldn't find anything in a quick search that answers your AC/DC queston directly, but I favor DC. There's no changing of polarity in a cloud like an alternator puts out. It's straight discharge, whether the typical negative type (cloud to ground) or positive (ground to cloud).
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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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