elve

[elv]
noun
  1. an extremely dim, flattened, expanding, reddish glow briefly seen over a thunderstorm, due to electromagnetic pulses from intense lightning.
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elve in Science

elve

[ĕlv]
  1. An extremely dim, short-lived, expanding disk of reddish light above thunderstorms, believed to be caused by electromagnetic pulses from intense lightning in the lower ionosphere. Elves last less than a second and can be as wide as 500 km (310 mi) in diameter.
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