Nacreous clouds (sometimes called mother of pearl clouds) form high up in the atmosphere (at altitudes of 15,000-25,000 metres). Due to their high altitude they recieve sunlight from below the horizon causing them to shine brightly before dawn or after dusk. Displays like this aren't common but are seen occasionally throughout winter.
These photos were taken around 10am, it's great being able to see such fantastic sunrises and cloud displays without having to get up at an unsociable hour!
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