Multiple Fireballs in a Reactive Plasma

Inverted fireballs (FBs) are plasma phenomena, which develop inside a highly transparent, positively biased grid electrode through electron impact ionization. The ionizing electrons are accelerated into the grid by the high potential on the wires. This leads to an enhanced plasma density inside the hollow anode as well as a strong light emission. FBs show a wide variety of properties. This behavior may manifest itself in different shapes of FBs, which are very sensitive to the physical parameters of the discharge.