|
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
Hallo,
I think every member of the meteoptic mailing-list has seen light pillars
in high clouds and perhaps pillars in diamond dust. Sometimes it is also
possible to see this phaenomenon during snowfall, especially during
nighttime at bright artificial lights.
On 25 th of December 1999 I made a very interesting observation of pillars
during rainfall.
The days before in Austria we had very low temperatures, at Schlaegl
(northwest of Linz in Upper-Austria) I measured -22°C. In the vallies the
cold stayed, in higher regions the temperature climbed up to 0°C and more
(inversion layer). On the evening of 25 th the temperature was at -4,8°C
when it started raining. Soon the streets were covered with slippery ice.
At artificial lights I saw bright pillars upon and below the light
sources. First I did not belive my observation - rain and ice-plate
crystals side by side? But later I observed falling ice crystalls in the
light of our entrance lamp. Slowly they fell down, glittering in front of
the dark colour of the door.
The phaenomenon lastet 15 minutes.
It was funny seeing two pillars produced by the spotlights of cars even
when the cars where behind small hills.
Best regards and best wishes for 2000
Karl
Karl Kaiser
http://home.eduhi.at/member/nature
|