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 - Show Coverage: The Old Gold National Antique Tractor Show - by Cindy Ladage. Over the fourth of July weekend, the Illinois State Fairgrounds in Springfield, Illinois, was the site of the Old Gold National Antique Tractor Show. Tractors of all makes and models were displayed and separted into categories by their age. Deere, Oliver and even a Wards and Keck Gonerman were part of the crowd. A sea of red International Harvester's seemed to be the the model with the biggest showing. The crowd was decent for the scorching July heat. The opening day started o
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