These are polar stratospheric clouds, also known as nacreous clouds. These clouds form at a very high altitudes and are best seen before or after sunset. Will never forget this evening.
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The goodbye
Eroded
In hiding
Autumn mood
Green on Black
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Arctic dream
Alligned
The Beginning
Light matters
Pastel Memories
Fairy tale flight
Invasion
Arctic lights
Flowing Away
Activity
Home of The Old Gods
Green nights
Fresh scars
Overview
Neuron
Pillow fields
Side by side
Streaming
Mountain View
Earth´s blood
Ice Saga
The Egg
Memorable
Fools Gold
Rogue Beauty
Peaking
Old Gods
From North With Love
Alienated
Earth´s Neuron
Old Lady And The Queen
Leg Breaker
Up in smoke
Consumed
;-)