Noctilucent Cloud Photograph - Noctilucent Clouds, Herring Structure by Pekka Parviainen

Noctilucent Clouds, Herring Structure is a photograph by Pekka Parviainen which was uploaded on May 6th, 2013.

Noctilucent Clouds, Herring Structure

Noctilucent cloud. These bright displays are seen in the middle of the night in summer at high latitudes. Seen here is an unusual crossed pattern,... more

by Pekka Parviainen

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Title

Noctilucent Clouds, Herring Structure

Artist

Pekka Parviainen

Medium

Photograph

Description

Noctilucent cloud. These bright displays are seen in the middle of the night in summer at high latitudes. Seen here is an unusual crossed pattern, known as the herring" structure. The composition of noctilucent clouds is unknown, but they are known to exist at 70-90 kilometres altitude - well above normal clouds. They are normally seen when the sun is 4-16 degrees below the observer's horizon, and have a whitish colour against a dark sky. Photographed in Finland."

Uploaded

May 6th, 2013