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Noctilucent clouds galore
http://forum.popastro.com/viewtopic.php?f=5&t=21218
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Author:  brian livesey [ Thu Jun 20, 2019 3:10 pm ]
Post subject:  Noctilucent clouds galore

There are spectacular displays of NLCs around the globe this month. The rich display of these other-worldly, electric-blue clouds has been put down to the unusually low solar minimum.
"The mesosphere is quite wet. Water vapour molecules are at their highest in 12yrs," said Lynn Harvey of the University of Colorado's Laboratory for Atmospheric and Space Physics.
June is the best time of the year to observe NLCs. The high altitude clouds form when water molecules stick to meteoric dust, forming ice clouds that glow blue when hit by sunlight. The solar minimum means that there's less UV radiation that normally destroys water vapour in the mesosphere. See today's http://www.spaceweather.com .

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