The Royal Air Force’s 99 Squadron released a video on Monday showing the phenomenon known as a “St. Elmo’s Fire.”
The fork-shaped discharge of atmospheric electricity is not lightning but has a similar look.
The RAF said the C-17 crew experienced it while flying through the Inter Tropical Convergence Zone (ITCZ) at night.
“The electrical weather phenomenon of St Elmo’s Fire isn’t dangerous, but it usually means you’re surrounded by storms!” the RAF tweeted.
The ITCZ is the region that circles the Earth, near the equator, where the trade winds of the Northern and Southern Hemispheres come together.
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