dark lightning

dark lightning

[‚därk ‚līt·niŋ]
(graphic arts)
A photographic effect in which lightning gives black photographic streaks instead of white due to multiple exposures caused by successive members of a composite flash. Also known as Clayden effect.
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References in periodicals archive ?
Washington, April 25 ( ANI ): Researchers at the University of Bergen have detected a burst of high-energy radiation known as "dark lightning" immediately preceding a flash of ordinary lightning.
Dark lightning is a burst of gamma rays produced during thunderstorms by extremely fast moving electrons colliding with air molecules.
Dark lightning is the most energetic radiation produced naturally on Earth, but was unknown before 1991.
Scientists were unaware then that a weak flash of dark lightning had preceded the bright lightning.
Researchers called for more satellites to study the invisible phenomenon of "dark lightning," which could potentially produce the gamma ray radiation equivalent of a full-body CT scan in an airplane.
The Team Dark Lightning from the JESS Arabian Ranches school did just that and proved to be a class apart when they won the F1 in Schools UAE National Primary Championship held at the Yas Marina Formula 1 Circuit in Abu Dhabi.