Plasma fireballs formed by microwave interference in air

@article{Ohtsuki1991PlasmaFF,
  title={Plasma fireballs formed by microwave interference in air},
  author={Yoshihiko Ohtsuki and H. Ofuruton},
  journal={Nature},
  year={1991},
  volume={350},
  pages={139-141}
}
DESPITE many experimental and theoretical studies, a widely accepted explanation of ball lightning has yet to be found. It is possible, however, that ball lightning is created by the interaction of different types of energy in the atmosphere1. Indeed, the production of a fireball by an electric discharge in an atmosphere containing dilute fuel gases such as propane has been reported2. We have also managed to produce several types of fireball by setting off electric discharges in an atmosphere… 
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References

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SEVERAL recent publications1–4 discuss possible methods whereby a localized gas discharge might be maintained by electromagnetic radiation. Recently a simple experiment to maintain an electrodeless
Ball Lightning and Bead Lightning
Experimental research on ball lightning
SummaryExperiments on producing ball lightning were made with discharge in flammable gas and/or aerosol. A long lifetime (2 s) ball lightning was observed in 2.7% ethane and 100 cm3 cotton fibers,