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At 03:29 PM 7/1/96 +0200, you wrote:
> I guess you seen iridescent clouds. Those are seen here quite
> often, but usually with pale and faint color and those are very
> never the Sun. As bright and colorful those are more rare.
>
> The mechanism is not the same as in halos. Halos are formed
> refraction/reflection in ice crystals, but iridescent clouds
> are formed in uniform sized water droplets in clouds. There
> could be regions in clouds where droplets have same diameter
> with each other. The diffraction from these droplets and
> interference between light rays from two different drops
> make those pure colors.
>
> Iridescence have the same mechanism like in coronas and it have
> some relationship also to rainbows (interference).
>
>
> -VeikkoM-
>
We often see coronae when the image of the sun and clouds are reflected
off surfaces. Would anyone know when irridiscent clouds are more often
seen or in what conditions they come out? I've noticed from observing
from the past few years that they tend to be seen in the Philippines
during our summer (thunderstorm season) and late rainy season times, but
are not normally seen during our cool months, when the skies and air
tend to be much drier.
Jun
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< Jun Lao, Editor, the Appulse >
< The Philippine Astronomical Society >
< Bringing the Heavens Down to the Filipino >
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