Sometimes called "Earth's tallest lightning," because they reach the ionosphere more than 50 miles high, Gigantic Jets were discovered near Taiwan and Puerto Rico in 2001-2002. Since then, only dozens have been photographed. They seem to love storms over water and are famous for surprising passengers onboard commercial aircraft.
The nature of gigantic jets and their possible association with other types of Transient Luminous Events (TLEs) such as blue jets and red sprites remains an active topic of research.
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