Re: LF: Re ELF…12.67Hz

[James Hollander <mrsocion@aol.com>]

Claudio,    This Alec Bennett 2007 Ph.D. thesis on Atmospheric Electricity you cited is quite interesting. Fine quantitative information and detector hardware photos and drawings, notes appended.  I'll look at his reference list before long, mainly to look for a paper on signal delay of transmission using atmospheric conductivity over some distance without wires.

http://www.met.rdg.ac.uk/phdtheses/Measurement of Atmospheric Electricity During Different Meteorological Conditions.pdf    

Air conductivity vs. altitude:   Scroll p. 92-93, paper p. 68-69. 

σ = 10-150 x 10^-15 S/m at 0-5km.( 10¹⁴ to 6x10¹² Ω-m).    

σ = 150-6000 x 10^-15 S/m at 5-25km.( 6x10¹² to 2x10¹¹ Ω-m).

Passive wire and Chubb electrometer at scroll p. 104-115, paper p.81-92.

   https://www.dekra-process-safety.co.uk/instruments/jci-electrostatic-instruments/jci140-field-mill-static-monitor 

Air-Earth Current Pyramid (AECP)  p. 94.

AECP Picoammeter:  Fig. 4.15 scroll p. 125, paper p. 102,  pp. 101-107.  Schematic and hardware photo with  measurements.

       Thanks again for the reference!

 73, Jim H    W5EST