Introduction
In 2019 sprite observations by Hank Schyma “VIBRANT RED SPRITES Jets & Mysterious Ghosts” and by Paul M. Smith “Bright sprite lightning event with trolls and green tipped streamer afterglow” appeared on YouTube ( https://www.youtube.com/watch?v=15Rdfz1UPJk and https://www.youtube.com/watch?v=o1NlZZHboSY). The images showed green emissions in the top of some sprites lasting well after the main sprite. The emissions were named “Green Ghosts” by Hank Schyma, and it was speculated that the green emissions were 557.7 nm atomic oxygen emissions well known to be present in aurora and airglow.