Hi Bert, thank you for the info. There must be a considerable charge being stored in the brushes at the endpoints of the leader in order to cause the brightness of the leader. This could account for the relatively large capacitances of TC arcs. These are much larger than those of thin wires and more like those of plumbing tubes. Udo These brighter regions appear to be "space stems" and "space leaders" - short sections of leaders that form ahead of a propagating negative leader. Brush-like streamers connect the space stem to the advancing leader, while the opposite end is fed by another set of brush-like streamers. Space stems and space leaders grow towards each other an merge, lengthening the main leader. Space stems and space leaders only appear in propagating negative leaders. They are observed in laboratory discharges, negative lightning, and apparently in Jeff's spiral coil discharges and occasionally other TC discharges. A previous discussion of these discharges can be found in the Pupman archives: http://www.pupman.com/listarchives/2009/Mar/msg00038.html Following are some URL's with background info (that are not behind academic publisher paywalls): http://www.irsweb.it/en/PDF/Theoretical%20modelling%20of%20the%20laboratory%20negative%20stepped%20leader.pdf http://www.lightning.ece.ufl.edu/PDF/Biagi%20et%20al%20%5B2010%5Da.pdf http://www.capturedlightning.com/Papers/Longgap1.pdf Bert Udo Lenz wrote:
Beautiful shots! On some of the photos the streamers seem to have bright sections along them. Do you have any explanation for that? The reason, that I ask is because the currents, which would cause a bright section, should have some distributed endpoints in order to have some capacitance. Udo ----- Original Message ----- From: "Jeff Behary" <jeff_behary@xxxxxxxxxxx> To: <tesla@xxxxxxxxxx>; "Kelly McJilton" <Klmcjilton@xxxxxxxxxxx> Sent: Tuesday, September 08, 2015 4:35 PM Subject: [TCML] Color photos of Phantom Streams and DC phenomenaFor the first time color photos have been taken of Tesla's phantom streams and Kinraide's various experiments. Hats off to Kelly McJilton who manages to do what I tried unsuccessfully for 10 years. Really great stuff. All photos are of corona from a 9" pancake coil operating from a 3500V 8mA neon sign transformer. Clear positive and negative phenomenas can be seen from the distinctly different fractal patterns (forked branches vs feathery plumes). http://www.electrotherapymuseum.com/WhatsNew2015H.htm Take a look, they are magnificent.Jeff Sent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla
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