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Hi Donatella – The clouds are produced as humid air flows over the upper surface of the wings. The air travels faster there and expands. As it expands it cools making the water vapour in it condense into tiny droplets – clouds. Sometimes these clouds show bright iridescent colours. More here – https://www.atoptics.co.uk/fz164.htm
A classic returns – 40 odd years ago someone dragged me outside one freezing winter afternoon to look at a halo display. I remember (I’m sure memory has hyped it up) magnificent arcs everywhere, each finely scribed across a milky blue sky. They were my very first ice-halos. I was hooked! But, how to find out their names? How they formed and more about them without the web? A search of bookshops unearthed Robert Greenler’s book “Rainbows, Halos, and Glories” – now a venerated classic by one of the fathers of atmospheric optics. It was pure gold. It got me going on all things optical up there and it’s inspired so many others to look up and search the skies. It’s sadly been unavailable for years but Bob, now a friend and colleague, tells me its back. More about it at – https://spie.org/Publications/Book/2573016?SSO=1
A classic returns – 40 odd years ago someone dragged me outside one freezing winter afternoon to look at a halo display. I remember (I’m sure memory has hyped it up) magnificent arcs everywhere, each finely scribed across a milky blue sky. They were my very first ice-halos. I was hooked! But, how to find out their names? How they formed and more about them without the web? A search of bookshops unearthed Robert Greenler’s book “Rainbows, Halos, and Glories” – now a venerated classic by one of the fathers of atmospheric optics. It was pure gold. It got me going on all things optical up there and it’s inspired so many others to look up and search the skies. It’s sadly been unavailable for years but Bob, now a friend and colleague, tells me its back. More about it at – https://spie.org/Publications/Book/2573016?SSO=1
