blue flash en · NOUN
Meanings
- A very rare phenomenon observed in the morning or evening when the sun is crossing or immediately below the horizon, in which a momentary flash of blue light appears above the upper rim of the solar disk, caused by refraction of light in the atmosphere.
- (qualifier:nuclear physics) A phenomenon sometimes observed when a criticality accident occurs in nuclear materials, inducing a discharge of radiation into the environment.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| blue flashes | Number=Plur | lexicographic |
Relateds
wikipedia: + (nuclear criticality) · wikipedia: + (meteorology)