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Home > All Images > 1993 > March > 26 Mar 1993

Images Dated 26th March 1993

Choose from 9 pictures in our Images Dated 26th March 1993 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Noctilucent clouds, herring structure Featured 26 Mar 1993 Print

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, 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

© PEKKA PARVIAINEN/SCIENCE PHOTO LIBRARY