Noctilucent clouds - 3rd July 2011 (Tony Cook)

Contains: Noctilucent clouds

Noctilucent clouds - 3rd July 2011

[This image is best viewed at full resolution with side to side panning.]

During a 3 week period centred on the summer solstice the northern skies are in permanent twilight at 54N where I live in the UK. Occasionally a superb noctilucent cloud display makes up for the inability to do regular astrophotography.

Noctilucent clouds are composed of very small ice crystals and are typically found at an altitude of 80km - on the edge of space. Even though it is night on the ground these clouds are directly lit by the sun. The reflected sunlight gives rise to these "night shining" clouds.

The view is from the village of Bramhope looking out directly northwards across the Wharfe valley to Norwood on the left and Armscliff Crag on the right (the bump on the horizon). The time was approaching local midnight.

This very wide panorama was taken with a 28-80mm Canon lens set at 50mm on a 40D Canon camera. Originally this was a 10 frame overlapping series of images which has been cut down to about 60% of the width of the original after blending them together with Autopano Pro 2.0. Each frame was preprocessed in Photoshop CS2 for noise reduction (Neat Image plugin). Post processing for a touch of controlled sharpening was done with Adaptive Richardson-Lucy deconvolution in Images Plus.

Cloudy Nights
Atmospheric optics and skyscapes

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