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Noctilucent Clouds
Contest Number: 168 Contest Theme: Night Sky Lens: Sigma 100-300 Camera: K-1 
Posted By: Mans Hagberg, 08-03-2020, 03:03 PM

Looking for comet Neowise I found the high Northern sky dominated by noctilucent clouds!

A rare sight. They are clouds at very high altitude, 76 - 85 kilometres. They are illuminated by the Sunīs rays slanting sidewise through the uppermost atmosphere while the lower atmosphere is in the Earthīs shadow.

Can only be seen summertime at high latitudes in the Northern hemisphere (at low altitudes in the Southern hemisphere).

Some very black clouds at middle height and a glow at the horizon.

Location: Norrkoping, Sweden. Time: July 21, 2020 01.31 local summer time.

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09-03-2020, 09:58 AM   #2
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