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 - 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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