Re: Poynting Vector Vortex Experiment

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

> >       Are those really helical sparks, or are they an optical illusion or
> > artifact of the two-dimensional photograpy?  There's a lot of motion in
> > the streamers, almost any discharge shows "banjo" effects etc.which
> > might confuse the camera and possibly the eye.  I see similar stuff here
> > but never looked helical to me.
> >
> > Ed
> 
> I visited the website and had a close look. They really do appear to
> be spirals. Interestingly, the spiral effect appears most
> dramatically where the streamer current is highest. I wonder what
> that's telling us.

	Certainly the heating of the air is greatest there, and streamers do
indeed "crawl around and wiggle". Can't imagine any non-thermal effects
which could affect the rather slowly varying ionization paths.  

>      Thanks to Terry for making the pics available BTW.
> 
> Regards,
> malcolm

Ed