From BBC News Online

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Thanks for bringing this up, Sticks. Interesting.
I wondered about that when I read it. Wouldn't the speed of sound at the surface be slower than the earth's rotation, for a lot of the earth? Up to about latitude 45. I know the geometry is not that simple, but still. Then I read the following quote:So, I'd like to understand Barrie Jones' argument a little more. Oops, here it is:I'm confused.

O no:Whew, that would explain everything

Cool!

I am pretty sure that shadow bands are produced by interference between bright spots on different parts of the sun. As for any sound associated with them, it might possibly be caused by a heating of the air in the nodes.

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Would that work? How?

so now shadows can have their own sonic boom?
has anyone ever noticed this happening with the shadows of supersonic aircraft?

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If this is something shadows do, I'd expect an aircraft shadow to produce an infrasound effect (in my book, the definition of "sonic boom" wouldn't include this) many orders of magnitude less than that of the Moon, for the difference in shadow size, and corresponding lesser solar-energy disruption, resulting in way less air displacement. The sonic effect of the aircraft's shadow might well be so small as to be undetectable even with fine instruments.

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If the lunar limb were to move across a bright point source of light,
observers on the Earth's surface would see bands of light race
across the ground due to diffraction; see this page for details:

http://spiff.rit.edu/richmond/occult/bessel/bessel.html

The Sun isn't a point source, of course, but in the stages of a solar
eclipse just before totality, the solar limb becomes very thin, and
finally a small set of point sources. The result can still be a set
of shadow bands.

Thank you StupendousMan. Very good and understandable explanation. Should put this one to rest!

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So I wonder how did the article come to contain:

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Hi all, In the audio world, there is a type of interference called "comb filtering" and it analogous to the interference patterns one sees in light when it is passed over the edge of something sharp like a razor blade (called diffraction ^^^). could this be what is being seen? Well stupendous man showed us that that ain't the case.


Maybe the reference to Infrasound means frequencies less than 20 hz and these frequencies incidentally have a wave length at 1 atm that is between 340 meters (1 hz) and 17 meters (20 hz)

are these shadows this size? ^^^^ I have never seen one.

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-work in progress--

could someone post a picture, these sound really cool

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-work in progress--

Yes, but a standing wave could bee seen to not be moving or moving very slowly if the modulation is constant. if the frequency bands are constructed with multiple frequencies, it could very easily appear to move forward and backwards and even stand still.

What would cause standing waves in the atmosphere is another question though.

fascinating....

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-work in progress--

This is the first I'm hearing of this. Any truth to it? Anyone know of links to papers on the phenomena?

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