[Lowfer] Alien e-probes

[Bill Ashlock]

Peter,

In order to figure out how to optimize E-probe performance it may be 
necessary to agree on a model for the wave that we trying to get a sample 
of. So let's put aside all the back and forth questions for a moment and see 
if we agree on the following.

First the surface wave:  My feeling (and this is based more on actual 
e-probing, and thinking about the data, than textbook info) is that the LF 
wave travels along the conductive ground and the has a curved ))))))))) 
equal-potential cross section. When we probe the wave with antennas of 
various heights (as long as they are much shorter than a WL) we measure 
nearly proportional increases in strength because the voltage at any height 
is greater than the voltage at ground level on an instantaneous basis.  
Conversely if the wave moves along with a straight llllllll equal-potential 
cross section there would be no gain when probing the wave at increased 
heights. We could probe this signal with two ground mounted E-probes and the 
differential voltage would be proportional to the spacing.

The sky wave could have a straight ////// equal-potential cross section but 
the angle in this wave would have the same effect on the E-probe as does the 
curved surface wave, so the voltage also increases with height.

What do you think?

Bill

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