Red sprites, blue jets, gnomes, trolls and the other electrical events in the middle atmosphere are all called TLEs by the people who research them. That’s for Transient Luminous Events. Every year in early December, the small community of TLE researchers convenes at the Fall Meeting of the American Geophysical Union.The first of these gatherings was sensational as hundreds of scientists crowded in large rooms to gawk and gasp at videos of red sprites and blue jets.

Thanks to Source: geology.about