These otherwordly looking images are showing Transcient Luminous Events, which are upper atmospheric optical phenomena associated with thunderstorms.
TLEs are usually invisible to the naked eye because they happen on millisecond timescales, too fast to be seen. They occur between 50 to 100 kilometers above the ground, a long-ignored area of the atmosphere, that is too high for aircraft but too low for satellites to investigate. There, the thin air interacts with strong electrical fields to ionize molecules and create arcing plasmas.
(Images by Thomas Ashcraft)