Скачать или смотреть Circumzenithal arc or Circumzenith arc, Bravais' arc, Upside down rainbow, Smile in the sky

Here is a rare phenomenan with sideways ice crystals high in the atmosphere, the light refracts sideways in a different way to a rainbow.

Filmed in East Dulwich London, 16-09-2012

Enjoy.

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From Wikipedia:

The circumzenithal arc or circumzenith arc (CZA), also called the Bravais' arc, is an optical phenomenon similar in appearance to a rainbow; but it arises from refraction of sunlight through horizontally-oriented ice crystals, generally in cirrus clouds, rather than from raindrops. It forms no more than one-quarter of a circle centered on the zenith and on the same side as the sun. Its colors are from blue on the inside to red on the outside of the arc. It is one of the brightest and most colorful halos. Its colors are purer than those of the rainbow because there is much less color overlap in its formation. The first impression is that of an upside-down rainbow.

The circumzenithal arc has been called "a smile in the sky". It is rarely noticed because it occurs so far overhead, but in fact is relatively common.[citation needed] Cirrus clouds which cause a sun dog can cause a circumzenithal arc when they reach the zenith, if the Sun is low in the sky.
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