South Pole 22º halo
22º halo image index 22-degree halo at the South Pole photographed by Marko Riikonen. The brightness at the halo top could be a trace of an upper tangent arc - or it could be where the ice crystal cloud thickens. Look carefully to the left to see a faint 46º circular halo. Image ©Marko Riikonen, shown with permission.