Polar stratospheric clouds are back again in the sky of Lappland

3
680

Polar stratospheric clouds are back again around the Arctic Circle.

The new outbreak of these colorful high-altitude clouds has started on December 26, 2015. Look at them floating above Porjus, Lappland, Sweden:

psc, polar stratospheric clouds, colorful polar stratospheric clouds december 2015, colorful polar stratospheric clouds lappland, colorful polar stratospheric clouds pictures
For the second time this month, sky watchers around the Arctic Circle are reporting an outbreak of colorful polar stratospheric clouds (PSCs).
psc, polar stratospheric clouds, colorful polar stratospheric clouds december 2015, colorful polar stratospheric clouds lappland, colorful polar stratospheric clouds pictures
Also known as “nacreous” or “mother of pearl” clouds, icy PSCs form in the lower stratosphere when temperatures drop to around minus 85ºC.
psc, polar stratospheric clouds, colorful polar stratospheric clouds december 2015, colorful polar stratospheric clouds lappland, colorful polar stratospheric clouds pictures
High-altitude sunlight shining through tiny ice particles ~10µm across produce the characteristic bright iridescent colors by diffraction and interference.
psc, polar stratospheric clouds, colorful polar stratospheric clouds december 2015, colorful polar stratospheric clouds lappland, colorful polar stratospheric clouds pictures
Once thought to be mere curiosities, some PSCs are now known to be associated with the destruction of ozone.
psc, polar stratospheric clouds, colorful polar stratospheric clouds december 2015, colorful polar stratospheric clouds lappland, colorful polar stratospheric clouds pictures
The best time to look for PSCs is just before sunrise or right after sunset, when the ground is dark but the upper atmosphere is still illuminated by sunlight.

During the precedent outbreak, the polar stratospheric clouds looked like UFOs floating in the sky of Norway.

Follow us: Facebook and Twitter

3 COMMENTS

LEAVE A REPLY

Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.