And they finally showed up. These look different than last years'. Last year, they almost looked like an eerie eye-in-the-sky. This year they look like a rainbow on either side of the sun. In this first photo, that is NOT the sun at the base of the rainbow. The sun was actually all the way to the right, almost at the base of the other side of the SunDog.
This is the view outside my window at work, so there's some reflection in the image.
I tried a polarizing lens to reduce the reflection, but it changed the exposure and coloring, and there's still some reflection.
Sundogs are formed by the refraction of light through hexagonal plate-like ice crystals whose flat faces are oriented horizontally and whose diameter is larger than 30 micrometers.
As sunlight passes through the crystals, it's bent 22 degrees. As a result, it looks like that light is originating from two spots on either side of the sun as well as from the sun itself.
Most sundogs and halos are white, but occasionally, some will show some color. That appears because white light is actually made up of many different wavelengths, or colors, of light. Each wavelength is slowed, and thus bent, at a slightly different angle than the next, which has the effect of separating the colors and making them individually visible. That's how rainbows are formed, but water droplets, which cause rainbows, are better refractors than ice crystals, and so the colors of a rainbow are more distinct than those of a sundog. With this ND weather, the water in the air is definitely NOT going to be droplets, and the ice crystals in the air are wonderfully suited to form ice crystals.
And so we have SunDogs! A slight reward for living on this frozen tundra. . . .