transient luminous event
Technical term in atmospheric physics for brief optical phenomena in the mesosphere and lower ionosphere, such as sprites, blue jets, and elves.
Transient luminous events are observed above thunderclouds.
Sprites are a type of transient luminous event.
Compound of 中間圏 (mesosphere) + 発光 (luminescence) + 現象 (phenomenon). A direct translation of the English term 'transient luminous event'.