Polar Stratospheric Clouds

By: Alex Conu


Region: Europe

Site: Oslo - Norway

Date: 2020 Jan 8


Impressive appearance of Nacreous Clouds after sunset in Oslo. Officially known as Polar Stratospheric Clouds (PSCs), they occasionally form in polar regions during winter, at high altitudes of 1525 km above the ground in the stratosphere. They are rare and appear bright with vivid and slowly shifting colors within two hours after sunset or before sunrise.

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