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1. A broad, high arch of radiance or glow seen occasionally in the western sky above the highest clouds in deepening twilight, caused by the scattering effect of very fine particles of dust suspended in the upper atmosphere.
2. The transient decay of a plasma after the power has been turned off.
The decay time involved is a direct consequence of the charged particle loss mechanisms, such as diffusion and

recombination. The magnitude of these quantities is determined by measuring the decay time under controlled conditions.


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use