|
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
>In case of lower rays ("cloud rays" the particles are
>dust and water droplets I think. In case of twilight
>(real "crepuscular rays") they are mainly molecules and
>the altitude of these are much higher in atmosphere.
I thought that the pink rays are caused by shadows (from clouds or
mountains below the horizon) cast on the purple red, which consists of
fine
aerosols at high altitude. Therefore, these rays are similar to normal
crepuscular rays. ??
>The terminology of these in different sources are very
>varying. Because the name "crecupuslar" is meaning
>twilight", I like to use name "crepuscular rays" just
>for those shadows seen in clear sky twilight colours and
>use different name for those lower level rays. I don't
>know if these have a common name in literature. We in
>Finland have invent an unofficial name "cloud rays".
>They have of course plnty of traditional names:
>"The ladders of Jacob", "The Sun drows water" etc..
The word crepuscular is Latin for "body" or actually "bodily". So, I
think
that that term can be used for any body that casts shadows and makes
sunlight visible as rays: clouds, mountains, trees and such.
I agree that these rays look different from normal "cloud rays". I like
to
call the twilight rays "twilight crepuscular rays" and any other solar or
lunar rays "crepuscular rays". But that's just my opinion, and I'm not
happy with my own nomenclature either...
Harald
|