Yep, seen that lots of times over Northern waters. Most interesting manifestation of St Elmo's I ever saw was a sort of glowing 'doughnut' around the AAR probe. It grew and grew in intensity until it was obvious something had to give. I called "Standby for lightning strike" to the crew ("static discharge" would only have confused...) and 5 sec later there was a big bang and everyone thought I was God - or at least a prophet!