What is nacreous cloud?
Jóna Björk Jónsdóttir
AnswerWe received a number of questions about nacreous cloud on Friday, 18 February 2005, after a fine display of this phenomenon in the eastern skies over Reykjavík in the early hours before sunrise. Nacreous cloud is a rare and extraordinarily beautiful iridescent type of cloud that forms in the stratosphere, generally at heights of between about 15 and 30 km. These clouds occur mostly at high latitudes and in the middle of winter. Their spectacular colours are seen at their best either after sunset or before sunrise, in half-light or even night-time conditions at ground level, with the sunlight illuminating them from below the horizon.
- Mannfred Lemke of the Iceland University of Education has posted on the web an interesting video clip taken the same morning. (Most Windows-based computers should be able to handle this clip).
- Further information and photographs of nacreous clouds can be found on various websites, for instance by clicking here.
Um þessa spurningu
Halldór Björnsson. „What is nacreous cloud?“. The Icelandic Web of Science 5.3.2005. http://why.is/svar.php?id=4791. (Skoðað 23.3.2017).