Louis wrote in a comment in the posting, Bari Conference: A scientific event unprecedented in Puglia:
. . . Professor Giulio Fanti told me that the corona discharge was possibly connected to ball lightning.
This interview-article was posted on the Holy Shroud Guild website but at my request my folder was deleted, for reasons that will soon be made known by me. I am sending it to Dan in pdf format, who can upload it if he wishes to do so. I can understand the pressure he faces. Welcome to the world of Shroud studies!
Here we go: Science and religion meet in Shroud research by Louis C. de Figueiredo.