Russ took this stunning image at Assynt, Scotland on September 26 2013, 12:45 PM (BST).
Conditions were warm and dry with no surface wind. Russ says
They’re the streaky ice crystal type of alto-cirrus. One of those photo opportunities which come along once or twice in a lifetime. Luckily I had a fantastic photographic subject to compliment them. The effect started as we arrived in the car-park and after an hour the effect had dissipated completely.