Pat Flannery wrote in
dakotatelephone:

On 2/20/2010 2:48 PM, Damon Hill wrote:


I'm surprised this has not been observed before; it's spectacular!

Same here; with all the launches we've done over the years, you would
have thought this would have occurred at some point in the past.

Possible factors: correct layer of ice crystals, correct sun angle, wide
angle view to catch the ripples. Obviously visible to observers without
binoculars or other optics, too.

--Damon