Noctilucent Clouds 2021-06-05

Noctilucent (“night-shining”) clouds are the highest in the atmosphere, at around 76-85km altitude. They only appear in the summer months at latitudes from 50-70º (north or south), when the sun is more than 6º below the horizon. Formed in the mesosphere at very cold temperatures from ice, dust and water vapour, their gossamer threads undulate […]

A Day In Clouds

That was 2017-06-20, that was. A beautiful blue sky with white fluffy wispy cirrus cloud catching the setting sun… …followed by a noctilucent cloud display around 1am: NLCs are the highest-flying clouds, occurring at altitudes up to 80km where the next highest type (cumulonimbus) only reaches 12km and most are lower still. Most typically they […]

Noctilucent Clouds, Perth, 20150623

A classic location for long-exposure night-time photography: standing on the bridge over the M90 at Rhynd, with the road snaking away into the distance… and a clear display of noctilucent clouds above Kinnoull Hill. From wikipedia: Night clouds or noctilucent clouds are tenuous cloud-like phenomena that are the “ragged edge” of a much brighter and […]

Noctilucent Clouds

Noctilucent (“night-shining”) clouds are a rare phenomenon: the highest clouds in the atmosphere, at altitudes between 47-53 miles, consisting of tiny crystals of water ice about 100nm in diameter and requiring very cold temperatures to form. Not fully understood, they are a recently discovered meterological phenomenon with no record of their observation before 1885. They also […]