Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun meteorology, astronomy A very
rare phenomenon observed inmorning orevening when thesun is crossing or immediately below thehorizon , in which amomentary flash of blue light appears above the upperrim of the solar disk, caused byrefraction of light in theatmosphere . - noun nuclear physics A phenomenon sometimes observed when a
criticality incident occurs innuclear materials, inducing a discharge ofradiation into the environment.
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