Noctilucent (Night Shining) Clouds over North Doncaster. They are typically observed during the summer months from latitudes between 50° and 70° north and south of the Equator. They only be seen during local summer months, when the Sun is below the observer's horizon, the clouds are at an altitude of around 50 miles, so are still in sunlight. They consist of ice crystals which reflect the Sunlight to the observer's location.
The focal length of the lens is 70mm. This image was taken on the same early morning as the other image but a little later on after the moon had risen. The cloud had moved somewhat and the light from the Moon and approaching dawn provided more ambient light. The sky is 10s and the foreground is 30s @ f2.8 ISO 800.