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A Rainbow Without Colors:  The Rare Fog Bow is Seen in Seattle

A Rainbow Without Colors: The Rare Fog Bow is Seen in Seattle

 This morning I used to be in a position to view one thing that I all the time needed to see.  

The white, colorless Fog Bow.

And I’ll present it to you now.  I knew there was going to be some fascinating fog motion this morning, so I biked all the way down to Magnuson Park on my approach to the UW.

The solar had simply come up….and that is what I saw–an arch of white gentle, the fog bow.


And right here is one other shot.  Pretty a lot all white…and far wider than a standard rainbow.
1605261107 311 A Rainbow Without Colors The Rare Fog Bow is Seen
The fog bow is in the identical location as a standard rainbow (reverse of the solar), however why no colours like a standard rainbow?
First, fog droplets–which are actually cloud droplets– are MUCH smaller than the raindrops that produce regular rainbows.  Raindrops are sometimes 2000 microns (millionths of a meter) in measurement, cloud droplets are about 20 microns in measurement.  To put it one other approach, raindrops are about 100 instances as massive as cloud/fog droplets.
A Rainbow Without Colors The Rare Fog Bow is SeenSo why does measurement matter?
For a standard rainbow, the solar’s gentle enters the raindrop and displays off the again.  And the sunshine is damaged up into numerous wavelengths of sunshine (totally different colours) as the sunshine goes between the air and the droplet.  The gentle is bent or refracted on the interface between air and water, with quantity of bending depending on the wavelength of sunshine.  This course of is known as dispersion.

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1605261108 470 A Rainbow Without Colors The Rare Fog Bow is Seen

But for a cloud droplet, one thing else occurs at properly.  The droplet is so small that it’s much like the wavelength of seen gentle (roughly .5 microns) and the wave-like nature of sunshine is revealed by way of a course of referred to as diffraction.  Such diffraction trigger the sunshine to be scattered in a variety of instructions, mixing the colours collectively.  Mixing all colours collectively offers you white.
In any case, I used to be excited to see the ethereal white fog bow.  Plus, the scene on the park this morning, with fog interspersed with sunny skies, was magical.
1605261108 503 A Rainbow Without Colors The Rare Fog Bow is Seen

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