Astronomy Picture of the Day



A Fog Bow Over California

Bild Upload von 18.02.2016 21:42

Bild Note: 0 (0 Votes)

previousoverviewnext
zorg.ch
#96196 by @ 16.11.2006 00:00 - nach oben -
A Fog Bow Over California


Explanation:
Is that white arch real?

What is being seen is a
fogbow,
a reflection of sunlight by water drops similar to a rainbow but without the colors.

The fog itself is not confined to an
arch --
the fog is mostly transparent but relatively uniform.

The fogbow
shape is created by those drops with the best angle to divert
sunlight to the observer.

The fogbow's
relative lack of colors are caused by the relatively
smaller water drops.

The drops active above are
so small
that the quantum mechanical wavelength of light becomes important and
smears out colors
that would be created by larger
rainbow water drops acting like small
prisms reflecting sunlight.

The above striking image of a
fogbow
was taken last week with the Sun behind the photographer.

Close inspection of the far right of the
full image
will show one of the two suspension towers of the
Golden
Gate Bridge
in
California,
USA.




Credit & Copyright