Hi Dave,

Perhaps there is some propagation by various paths (through the ground and
through the air)? If so, maybe there is a difference in the prop. speed in
the two media and you could use that to determine distance (you would
actually receive two pulses, and you could time the delay between them).
There may also be some dispersion (higher freq portions of the pulse may
arrive earlier or later than the low freqs.) and you may be able to exploit
that distortion of the pulse.

Sean

At 04:06 PM 3/10/01 -0500, you wrote:
>At 02:44 PM 3/10/01 -0600, Jim Paul wrote:
> >You could put up a photo sensor, and time the delay between the
> >lightning flash as detected by the photo sensor and the signal from
> >the coil sensor.  Divide this by 5, and that will be the approxiamte
> >distance in miles.
>
>Interesting, but I'm not likely to get the flash at any useful distance.
>Why the delay? Mag propagation is supposed to be at C, as well as optical.
>
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