Driving home (southbound) happened to look up to view the big cloud and glimpsed this prismatic feature on the leading edge of the cloud. Pulled off the road, and rolled down the window to make sure it wasn't from the tinted windshield and my sunglasses. Took two shots with the phone. It was high noon, the sun directly overhead. I'm not sure what I'm looking at. Is it the lower portion of a 22° halo? Lower tangent arc? (although the ends are going up, not down). A confused rainbow? Also, what is the faint white line just below the sun's rays? it seems to complete an oval with the rainbow portion. Tell me great oracles!

Samsung Galaxy S7

Edited in Snapseed