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Dawn Nacreous Clouds SE Norway
Arne Danielsen
(astrophotography
and atmospheric phenomena) writes:
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"On January 31st 2005 a very strong display of nacreous
clouds could be seen from Southern Norway. I noticed the colorful
clouds as soon as I woke up that morning and immediately mounted
my camera on a tripod and started shooting a sequence of images
from my apartment balcony some 20km South of Oslo. The first
image was shot at 07:52 local time (06:52UT) and I intended
to shoot 2 images per minutes until the clouds disappeared.
However, after almost 2 hours the clouds were still very bright,
but I really had to leave for work and regrettably had to end
the sequence at 09:47 (08:47UT) after 231 exposures.
I could easily follow the clouds as I was taking the train into
Oslo. Every hour or so I checked the sky and the clouds could
be seen all through the day. The clouds started to become much
brighter and more colorful as the Sun started to set and I grabbed
my camera and went down to the dock to shoot a few more images."
Arne compiled the time-lapse
video (4.9MB) from reduced size versions of his 231 dawn images
taken 30s apart. The 15 fps animation effectively speeds up
the cloud evolution by 450X.
Watch the wave motion of the clouds and how the iridescent regions
stay relatively stationary.
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©2005 Arne Danielsen, shown
with permission |
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