Posted on Jan 10, 2020

APOD: 2020 January 10 - Nacreous Clouds over Sweden

Maj William W. 'Bill' Price

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Good Red Friday morning, Rallypoint. Today's Astronomy Picture of the Day is titled "Nacreous Clouds over Sweden." These clouds are called nacreous due to their iridescence, and are generally found in the winter polar stratosphere at altitudes of 15,000–25,000 m (49,000–82,000 ft). Because of their height, these clouds can diffract sunlight after sunset and before the dawn. Noctilucent clouds (seen in previous APODs) form at even higher altitudes of 76,000-85,000 m (248,000-449,000 ft) are visible only when illuminated by sunlight from below the horizon while the lower layers of the atmosphere are in Earth's shadow.

APOD: 2020 January 10 - Nacreous Clouds over Sweden

Posted from apod.nasa.gov

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LTC Stephen F.

Posted 5 y ago

Five Of The Eyes | "Nacreous Cloud" (Live Acoustic)

Here's is our second video we filmed with Knack Factory for the 2016 NPR Tiny Desk Contest. We never submitted this video, as we decided to go with the other...

Thank you, my friend Maj William W. 'Bill' Price for posting the NASA Astronomy Picture of the Day fro Friday, January 10, 2020 entitled "Nacreous Clouds over Sweden."
Image: Nacreous Clouds over Sweden - Image Credit & Copyright - P-M Hedén (Clear Skies, TWAN)
"Explanation: Vivid and lustrous, wafting iridescent waves of color filled this mountain and skyscape near Tanndalen, Sweden on January 3. Known as nacreous clouds or mother-of-pearl clouds, they are rare. This northern winter season they have been making unforgettable appearances at high latitudes, though. A type of polar stratospheric cloud, they form when unusually cold temperatures in the usually cloudless lower stratosphere form ice crystals. Still sunlit at altitudes of around 15 to 25 kilometers the clouds can diffract sunlight after sunset and before the dawn."

Five Of The Eyes | "Nacreous Cloud" (Live Acoustic)
https://www.youtube.com/watch?v=o9je6xVXmow

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