We had a very bright and long lasting sun halo over La Paz, Bolivia this morning, in fact it's still going! As well as the very clear and bright 22° halo and a 46° halo / circumzenith arc (both with a full spectrum like a rainbow) there was also a third white halo with pretty much the same diameter as the 22° halo and overlapping it, a bit like a Venn diagram. I've never seen this 3rd halo before, would you know what it is? It doesn't really seem to fit the description of a tangential arc.

I've just posted this and a few other photos on my Facebook page https://www.facebook.com/magicalandesphotography/ If you are interested I can send you a few more showing the 3rd white halo

Many thanks, kind regards!
James Brunker

Canon 5DMk3, EF 16-35mm L II lens at 16mm

Just conversion from RAW to jpeg file