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 […]
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 […]
It’s just a week off being the longest day, and it seems never to really get dark at night around here at the moment. Still. While that precludes shooting the aurora, instead it’s noctilucent cloud (NLC) season – just started in the past couple of days so I was very pleased to capture these last […]
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 […]