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Noctilucent Clouds

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Noctilucent Clouds

Post by Dragon on Wed Apr 11, 2018 2:32 pm

Night clouds or noctilucent clouds are tenuous cloud-like phenomena in the upper atmosphere. They are made of ice crystals and are only visible in a deep twilight. Noctilucent roughly means night shining in Latin. They are most commonly observed in the summer months at latitudes between 50° and 70° north and south of the equator. These clouds can be observed only during local summer months and when the Sun is below the horizon for the observer, but while the clouds are still in sunlight.

They are the highest clouds in Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 kilometres (47 to 53 mi). They are too faint to be seen during daylight, and are visible only when illuminated by sunlight from below the horizon while the lower layers of the atmosphere are in the Earth's shadow. Noctilucent clouds are not fully understood and are a recently discovered meteorological phenomenon;

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Re: Noctilucent Clouds

Post by Dragon on Wed Apr 11, 2018 2:33 pm


Credit: Nasa

Noctilucent clouds photographed by the crew of the ISS.

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Re: Noctilucent Clouds

Post by Dragon on Wed Apr 11, 2018 2:35 pm


By Ireen Trummer - Own work, CC BY-SA 4.0.

Noctilucent clouds near the northern tip of Estonia.

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Re: Noctilucent Clouds

Post by Dragon on Wed Apr 11, 2018 2:37 pm



They may be studied from the ground, from space, and directly by sounding rocket.

 
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Re: Noctilucent Clouds

Post by Dragon on Wed Apr 11, 2018 2:38 pm



ISS Timelapse - Noctilucent Clouds.

 
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Re: Noctilucent Clouds

Post by Dragon on Wed Apr 11, 2018 2:40 pm



Noctilucent Clouds, NLC's for short, (aka Night Shining Clouds or Polar Mesospheric Clouds) are the world's highest types of cloud forming on the edge of space at height of about 80 km (50 miles) which is also height where auroras occur.

Unlike most of other clouds types, which are mostly made of water vapour, NLCs are comprised of extremely small ice crystals.

They are normally too faint to be seen, and are visible only when illuminated by sunlight from below the horizon while the lower layers of the atmosphere are in the Earth's shadow.

 
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Re: Noctilucent Clouds

Post by Cloud on Wed Apr 11, 2018 9:02 pm

Oh wow, beautiful I really like those

Great video too. admire
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