Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx> Hi Jim,I bet that if the leaders propagate at a rate of say a 1000 advances per sec. there would be signal occuring every 1000 Hz in the spectrum (assuming both even and odd harmonics). Would this be the resonance you are referring to or is there a resonance in frequency determined by the length of a leader advance (sorta like the leader acts as an antenna with a length associated with the length of the advancement). Paul Nickelson captured lighning EM radiation with audio like frequencies. Maybe he can chime in here:-))
Gerry R.
Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>Yes.. this is in fact the case. There's also a kind of resonance effect for the length of the spark. For instance, lightning shows a strong signal at around 80 MHz, correlated to the jump size as the stroke develops.