I was reminded of the phenomenal rainbow from last year's burn. Everyone there witnessed two 180 degree arches of the boldest and brightest rainbow imaginable. Some claim to have seen a triple rainbow, though it was fleeting if there at all. However, I saw a bizarre echo of colors under the first rainbow - which I've never seen anything like it before or since. There were 3 to 5 faint stripes of vibrating color in the 2 o'clock position of the arch. I've spoke several others about it
and most didn't see it, but I know it was there. Since then, I've had many conversations about that moment, and it seems that a collective feeling of awe prevails from that special occasion. So I've been wondering, what exactly creates a second rainbow?
Wikipedia offers "Secondary rainbows are caused by a double reflection of sunlight inside the raindrops" and as a result "the colors of a secondary rainbow are inverted compared to the primary bow."
"A third, or tertiary, rainbow can be seen on rare occasions, and a few observers have reported seeing quadruple rainbow" Echoing stripes below the first arch are very rare, but can happen too.
And I'm happy to learn that I wasn't imagining things, there is infact something called
Supernumerary Rainbows "caused by interference between rays of light following slightly different paths with slightly varying lengths within the raindrops" It's the result of constructive and destructive interferences. "The very existence of supernumerary rainbows was historically a first indication of the wave nature of light". Evidence that light is a wave! That is so cool. Here is a Flikr pool of
supernumerary rainbows.
Mother nature is the ultimate effects coordinator, and she sure got the invitation for 2007: First we saw the full lunar eclipse at midnight monday night, then the rain shower in the high desert and legendary rainbow that followed, and let's not forget the fierce dust storms while everyone was packing up and leaving.
Nearly a week before leaving for the Burn '08, can't wait to see what's in store this year...