Click link to see rainbow
MYSTERY RAINBOW: What does it take to make a rainbow? Two things: raindrops
and sunlight. Raindrops act like tiny prisms
>, catching sunbeams and
splitting them into their primary colors.
On Sept. 26, Bruno Nolf <mailto:nolf.bruno2@...
> of Belgium observed
something strange: a rainbow with no sun and no rain. "It was a very strange
rainbow," says Nolf, who snapped this picture:
"This red rainbow <http://www.sundog.clara.co.uk/rainbows/redbow.htm
> is a
mystery because the sun had set four minutes earlier and was well below the
horizon," says atmospheric optics expert Les Cowley
>. "Furthermore, according
to Nolf, there was no rain falling and none visible on local weather radar!"
Cowley and colleague Gunther Konnen, a meteorologist, may have an
explanation: Thousands of feet above Nolf, the sun had not yet set. (Think
about it: "If your flight has ever taken off shortly after sunset you will
see the sun rising again as the airplane climbs," notes Cowley.) Somewhere
off in the distance, they speculate, a mile-high rainstorm that somehow
evaded the radar caught the reddened rays of the setting sun, producing the
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