Since you ask if anyone has experienced "St. Elmo's Fire, aurora other strange atmospheric conditions", may I put in a plug for my thread under Flight Deck Forums: Questions - Survey: have you seen aurora below or "around" your aircraft.
Scientists say it's impossible but I saw aurora below an aircraft I was flying in in 1967. So I'm asking pilots to report whether they've seen it too, as corroboration. If enough pilots report they've seen it, and provide lots of details about it, perhaps the scientists will take this seriously and begin to look into it. Especially if the next *future* instance occurs and pilots on different aircraft report it independently on PPRuNe and back up each other's accounts.
By the way, I don't think what I saw in 1967 was St. Elmo's Fire. But I'd be interested to hear your opinion, based on the description in my post/thread.