Meet an omega sunset and sunrise
An omega sunset or sunrise is an inferior mirage. It's produced by a layer of warmer and less dense air close to an ocean surface.
The post Meet an omega sunset and sunrise first appeared on EarthSky.
What causes an omega sunset or sunrise?
Les Cowley at the great website Atmospheric Optics explains omega sunsets and sunrises this way:
As the sun descends a second sun rises from the water. Eventually the two join at a red hued vertically stretched ‘stem.’ Jules Verne likened this appearance to an Etruscan vase. The stem shortens and thickens until the two suns appear like a Greek letter omega …
The lower sun is not a reflection from the water. It is an ‘inferior mirage’, so named not from any poverty in appearance but because the miraged sun is below the ‘real’ one. The lower sun is an inverted image. It’s produced by refraction by a layer of warmer and less dense air close to the ocean surface. The discus shape is a combination of the upper limb of the erect sun and an inverted image of it beneath.
Omega sunset from 2015
Bottom line: Omega sunset seen over Venice Beach, California in November, 2015.
Click here for a more detailed explanation of Omega sunsets and sunrises
The post Meet an omega sunset and sunrise first appeared on EarthSky.