Michael, congratulations to interesting observations. Have you any photos on the web?
Was a high cloud display. Heliac arc in high clouds is rarity. Congrats! Hope to see photos soon.
Roman, Yes that was a rare treat before I got those halos I got elliptical halo. I have photographed a lot of rare halos but those rare arcs from columns were had me saying thank you God quite a few times. I don't have the pics on the web but I can email them to youMarko, Yes that was a high alittitude cirrus cloud display and don't worry I got the pics, just have to send em.