Hard facing Electrodes 6 Plasma torches 6 Transferred arcs 6 Anode surfaces 4 Anodes 4 Cathodes 4 Dominant frequency 4 Dynamic behaviors 4 Dynamics 4 Electric discharges 4 Electric fields 4 Electron energy levels 4 Fighter aircraft 4 Floating conditions 4 Flow of gases 4 Gas heating 4 Ionization of gases 4 Nozzle surface 4 Nozzles 4 Plasma jets 4 Probes 4 Thoriated tungsten 4 Time correlations 4 Anode arc reattachment 2 Arc reattachment 2 Arc temperature 2 Average deviation 2 Collisional plasmas 2 Correlation methods 2