From the article: "Cranks who claimed that the aurora borealis makes a noise when it lights up the Northern sky have been proven right by science."
(Does this mean that they are no longer 'cranks'?)
From the video: "It is yet scientifically unproven that this clap sound is related to aurora borealis"
(I think they mean 'not yet scientifically proven', but I'll let that pass).
So, what is it?