Transient luminous events can be another source of ionization in the upper atmosphere.
Source: wiktionary
Transient luminous event
Synonyms for "transient luminous event" (1 found)
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Noun(1 words)
Sample sentences
3 total sentences available.
During World War II (and probably before), high flying pilots were reported to have observed unexplained aerial phenomena (UAP), often now called transient luminous events (TLE’s), particularly in the vicinity of thunderstorms.
Source: wiktionary
Known as Transient Luminous Events (TLEs), these unusual features were first spotted by accident in 1989.
Source: wiktionary