Coronal Colours, Cambridge
Sighted by Conor McManmon at Cambridge, England in late afternoon 30th March '16. Cloud fragments show bright iridescent colours that, more complete, might make a corona.
All images ©Conor McManmon, shown with permission
Upper image: A Mie scattering calculation of a corona using IRIS. The central aureole is 'overexposed' in order to best show the rings.
Lower image: The same calculation but plotted to show the central aureole colours. The aureole centre has blue hues. Its outer regions are straw/red coloured. Compare these with Conor McManmon's images.