There was a PBS program a few years ago called "At the edge of space". It covered Sprites, and other phenomena.
The PBS site only shows a preview now, but I found it on YouTube.
Greg H.
I was going to mention that PBS "Nova" series program episode too (Season 40, Episode 23).
Here's the program link (below), it has a description, etc.,
and a full transcript. PBS now only makes program streams available for a short time, or to members (Passport), or you can buy a DVD/Bluray.
Can't blame them, they have to pay for producing this good stuff.
It was a danged good program, those sprites (and blue jets, etc) are scary weird stuff (Wikipedia link at bottom).
http://www.pbs.org/wgbh/nova/earth/edge-of-space.htmlhttps://en.wikipedia.org/wiki/Upper-atmospheric_lightning