Nacreous Clouds - take 2
Finally another sighting of those rare nacreous clouds. More on flickr .
Comments
Is this related to the northern light effect?
No, not linked at all. Northern lights are caused by particles from the Sun, while this type of clouds is still unclear what it actually is. NASA just launched a mission to found out more about it (http://en.wikipedia.org/wiki/Aeronomy_of_Ice_in_the_Mesosphere).
Nacreous clouds or mother of pearl clouds will only be seen just after sunset or before sunrise, they form in the stratosphere at heights of between 6-18 miles when the temperature there falls below -80°C and are ‘probably’ composed of ice particles with a liquid coating of nitric acid tri-hydrate. They appear bright because they are high enough to be illuminated by the sun long after local sunset and the pastel colours arise through diffraction or interference effects in much the same way that colours appear in a film of oil on a puddle of water. Aurora borealis (northern lights) & aurora australis is the emissions of photons in the Earth's upper atmosphere & not connected to these clouds formations.
Rob Benedict (UK)
Life Line
What new fresh hell is this?
"Please click here and tick the box if you DO NOT want to be opted in."
And when you click on the non-visible link:
"[ ] I DO NOT want to be opted in."
@jamesholden Have you ever seen the Expanse? One of the main characters shares your name!
I walked 4.4km in 51m58s
I walked 8.2km in 1h40m07s
I walked 2.4km in 38m25s
@Edent With your ActivityPub implementation, have you figured out how to allow quote posts for your bot posts yet?
📷 Brown Cap in the Grass
🚩 Herikhuizerweg, Rheden, Nederland
I walked 0.9km in 11m17s
I walked 2.8km in 25m32s
I walked 4.6km in 1h8m02s
I hiked 23.0km in 4h10m15s
I walked 3.9km in 39m07s
After my PHP 8.5 in Leeds last night, it's now time to head to Rotterdam to give the same talk there tonight!
It's cold out here, but atleast the snow is now gone.
I walked 1.7km in 13m18s
📷 Avenue Gardens
🚩 Princess Road, London Borough of Brent, United Kingdom
#AutumnColours #FallColours #Photography
📷 Leafy Entrance
🚩 East Heath Road, London Borough of Camden, United Kingdom
#AutumnColours #FallColours #Photography
📷 From Green to Yellow.
🚩 St John's Wood Road, City of Westminster, United Kingdom
#AutumnColours #FallColours #Photography
I walked 9.1km in 1h56m24s
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