Kyse näyttäisi olevan harvinaisesta ilmiöstä. ”Muistuttaa bensaa.”
On Sunday, December 17, the Polar stratospheric clouds were seen all over Finland!
Polar stratospheric clouds (PSCs) are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 m (49,000–82,000 ft). They are best observed during civil twilight, when the Sun is between 1 and 6 degrees below the horizon, as well as in winter and in more northerly latitudes. Wikipedia














