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Noctilucent Clouds

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Article Information
Category: Weather Weather
Content source: SKYbrary About SKYbrary
Content control: EUROCONTROL EUROCONTROL
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Tag(s) Cloud Formations

NLC

Definition

Very thin clouds of water ice crystals located in the Mesosphere at a height of 75 km to 85 km.

Description

Noctilucent Clouds are normally only visible in twilight, when the sun is below the horizon and the surface and troposphere are in darkness. Little is known about the formation of these ice clouds so high up in the atmosphere.

nocticulent
Noctilucent Clouds photographed at twilight by Mika Yrjölä in August 2003 in northern Sweden

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