Strange clouds...

These clouds were out just before sunset yesterday too. Bright and shining....
I don´t know what they are called, but they must be very high in altitude to catch the sun like that.

strange.

And look, my local newspaper had a feature about the phenomenon....

Polar stratospheric clouds (PSCs), also known as nacreous clouds, are clouds in the winter polar stratosphere at altitudes of 15,000?25,000 metres (50,000?80,000 ft). They are implicated in the formation of ozone holes; their effects on ozone depletion arise because they support chemical reactions that produce active chlorine which catalyzes ozone destruction, and also because they remove gaseous nitric acid, perturbing nitrogen and chlorine cycles in a way which increases ozone destruction.
Soruce: Wikipedia