|
meteoptic-l [ät] ursa.fi
message archive
This is meteoptic-l [ät] ursa.fi message archive.
Note, your can reply the messages on this page only if your
are already subscribed the list.
» To the end of the list/message
Paul Williams: "Re: Mother-of-pearl clouds" (Feb 23, 11:13):
> The pastel colours are often very subtle and are easily washed
out by
> bright sky. It is seen most often in clouds relatively close to the
sun: about
> 15° to 30° from the sun. It is much easier to see with sunglasses
> (unpolarized) to reduce the surrounding brightness. Small cumulus
clouds, or
> small parts of larger cumulus clouds seem to be most effective in
producing
> large colour displays; however I have seen irridescence in cirrus clouds
as
> well.
>
Mother-of-pearl clouds are stratospheric clouds and should not be
mistaken for common tropospheric clouds such as cumulus and cirrus
clouds. These mother-of-pearl coulds usually located some 20-30
kilometers above the ground and are associated to abnormally cold
weather conditions in that region. The process responsible for their
colours is likely similar to that of iridescent clouds, I assume.
-Timo
|