Yeah, they really are scary, the noise is horrific, you really aren’t sure what is going on. The fact that they move so fast, unnerves you. Both of my sightings were bigger than that picture, and decidedly round in shape. It was like a glowing ball of un-contained plasma a little smaller than the size of a Volkswagen.
When I was a kid I remember the movie “Forbidden Planet”, I sure thought it was real then.
It WAS real then

Electrified orbs, fireballs and the like have been part of the phenomena for centuries.