Evidence is provided about ball lightning behaviors. It is shown that micro ball lightning has been produced in transmutation devices, and the plasmoid markings of 9 groups of researchers were discussed. This article was published in 2009.
The three images above show plasmoid markings in the lexan casing of the transmutation electrolysis cell in the Fusion Studies Laboratory of George Miley. The pictures were taken by me in 1996. The first was like a donut, and there is another ring marking at the bottom. The donut shaped one was delineated with computer software. The second and third images show microplasmoid emission from the surface of plastic beads that were contained together with electrodes inside the lexan casing.
E. Lewis, Tracks of Ball Lightning in Apparatus? JOURNAL OF CONDENSED MATTER NUCLEAR SCIENCE, 2, May 2009. The whole journal issue is downloadable at the link above.