Re: Fireworks Image

[George L Smyth <GLSmyth@xxxxxxx>]

J.Wood wrote:
> 
> At 09:36 PM 7/7/98 -0400, you wrote:
> >I put up the fireworks image with, what I call, a "dome" above the explosion.
> >Please give it a look at http://www2.ari.net/glsmyth/north.htm and give me
> >your guesses as to why it's there.
> >
> >Thanks -
> >
> >george
> 
> George, I would guess that you have captured the shockwave from the
> explosion.  How it is reflecting light I do not know, but it is reminiscent
> of sonic shock waves.  With our humidity on the 4th of July, even in
> suburban Bowie, it may compress the air enough to relect light from a
> reverse con trail.
> 
> Jim

Sounds pretty far-fetched, but I don't have anything to dispute your statement. 
The only thing I can think of is that we need to remember that the exposure time
was probably between about 15 and 20 seconds.  Were it a shock wave, I would
think that it would be diffused (and not noticeable) because of the exposure
time.  I don't know enough about physics to know about this one way or another. 
Perhaps if a shock wave appears at a certain ring of distances from the source
this would be correct.  Just thinking out loud.

george

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