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mirage

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atmospheric optics

atmospheric optics  

The various optical phenomena that occur in the atmosphere and arise through diffraction, reflection, refraction, and scattering. These include glories, haloes, iridescence, mirages, rainbows, and ...
fata Morgana

fata Morgana  

A mirage; originally (in Italian) ‘fairy Morgan’, referring to a mirage seen in the Strait of Messina between Italy and Sicily and attributed to Morgan le Fay, whose legend and reputation were ...
green flash

green flash  

An optical effect, seen under favourable conditions at the moment of sunset or sunrise, in which the small uppermost fraction of the Sun's visible disk briefly appears intensely green as a result of ...
loom

loom  

1 See oar.2 An effect of refraction in a light fog at sea which makes objects look larger than they are. ‘That ship looms large’, the dim outline of a vessel through fog and appearing larger than it ...
mock mirage

mock mirage  

A term proposed for a recently recognized optical effect in which an observer, sited above an inversion layer that gives rise to anomalous propagation (ducting), sees a section of the image of a ...
Novaya Zemlya effect

Novaya Zemlya effect  

A form of abnormal refraction, where ducting of light from the Sun along an inversion for extremely long distances enables an image of the body to be seen when several degrees below the geometrical ...
refraction

refraction  

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The bending of a ray which travels obliquely from one medium to another, at the interface separating the two; it is caused by the contrast in velocities with which the ray travels in the two media, ...
sinking

sinking  

A refraction effect in which an object normally visible on the geographical horizon apparently sinks beneath it. It occurs when air density decreases with height at a lower rate than normal, or ...
stooping

stooping  

A refraction effect that causes distant objects to appear compressed vertically. It occurs when the lowermost layer of air has a markedly lower density than higher layers, i.e. when it is ...
towering

towering  

A refraction effect that causes distant objects to appear elongated vertically. Although there is normally a decrease in air density with height, when this is far more rapid than normal (i.e. there ...

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