from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun meteorology, astronomy A very
rare phenomenonobserved in morningor eveningwhen the sunis crossing or immediately below the horizon, in which a momentaryflash of blue light appears above the upper rimof the solar disk, caused by refractionof light in the atmosphere.
- noun nuclear physics A phenomenon sometimes observed when a
criticality incidentoccurs in nuclearmaterials, inducing a discharge of radiationinto the environment.
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