That's quite a coincedence. I just saw a double rainbow a week ago and I don't remember ever seeing one before. Quite spactacular. Thanks for posting the photo.
Those are nice. Last year (June 13), a tornado touched down in the area. I stood outside watching it. /forums/images/graemlins/crazy.gif /forums/images/graemlins/tongue.gif After the storm, the roads were still wet. A rainbow appeared. It was so bright it was reflecting off the road. It was beautiful. There was also a second rainbow, but it wasn't as bright as the first one.
One night about 10 yrs ago, I was coming across NM at the 284 MM, the moon was full and to the south of I40 and a it was raining to the north, there was a, I guess you'd call it, the most spectacular moon bow. Only one of those I've ever seen.
</font><font color="blue" class="small">( I hadn't noticed the color reversed, can you explain that? )</font>
I don't want to jump in on texbaylea's answer to this, but it's been a few days, so I'll just offer this. To understand why the colors are reversed in the second rainbow, it helps a lot if you already know how the first rainbow is formed. It basically involves sunlight bending and bouncing inside raindrops, with each raindrop acting like a little prism.
This link is one of the best I have seen for explaining it all.
If you look at Tom McD's link, the front surface where the light rays exit the rain drop is also reflective like a "half-silvered mirror" so a portion is reflected back into the rain drop and further dispersed. A "second order" rainbow results when this portion of the light is reflected back and out. Multiple orders exist but are so dim as not to be seen. I have seen 1 or 2 photos that included third order rainbows and the color order is same as the first.