NLCs possibly on the approach

A graph of the temperature of the mesosphere above the UK taken by the Aura satellite and processed by Bath University suggests that we’re on the verge of entering the Noctilucent Cloud season. The mesospheric temperature anomally means that this layer of the atmosphere cools as we warm underneath it. Below a certain temperature, ice crystals can form and create the highest of the three cloud layers – NLCs. These thin clouds reflect sunlight when the Sun is an hour or so below the horizon (before sunrise or after sunset) producing ethereal glows in darkened skies. During this year’s season, BBC Radio Four are running an experiment to collect together observations of NLCs across the UK, see more on their facebook page.

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