I had a similar thing in Oz once, between Charleville & Mt Isa at A080. Shimering green-ish flames licking up the windscreen. Sort of a curtain effect. No heat noticeable. When I brought my fingers near the windscreen sparks formed from the screen to my fingertips. The sparks would follow my fingertips across the windscreen.
Didn't last very long (minute or so??) but fascinating & eerily beautiful while it was there.