Captured by Peter Otoole at Letterkenny, County Donegal, Ireland on Sunday June 20.
Images ©Peter Otoole, shown with permission.
|Refraction through randomly oriented hexagonal ice crystals made the steeply sloping band of colour – a 22 degree ice halo fragment. At its centre and barely distinguishable from it shines a weak sundog with a hint of bluish tail.
22 degree halos and sundogs always have red sunwards – the sun is off image to the right.
At right a contrail imprints its dark shadow onto lower cloud. The convolved clouds around the halos suggest that their icy crystals grew from the newly minted water vapour of aircraft engines.