Is it my imagination? I have watched the animated snapshots of fofu1 plasmoid formation hundreds of times now and wonder why the bright spot in the middle(plasmoid) seems to jump up by at least its diameter. is this a magnetic reaction with the center electrode? hot gas pressure? if the geometry was changed would that keep all of those hot ions in one spot? it seems to me that if it has heated the gas in that area enough to glow that energy is lost during the shift away from the electrode.
