This is the second infralateral arc I have seen in my life. It is formed by an interaction between the sun’s rays and ice crystals. I witnessed this phenomenon today (12/01/13) in Williamsburg, VA around 1:30 pm, thanks to being stuck in traffic for fifty minutes. I guess you can say I was lucky.
![Digiprove seal](https://poeticambiguity.com/wp-content/plugins/digiproveblog/dp_seal_trans_16x16.png)