Creation and characterization of inverted fireballs in H2 plasma

In this paper we present Langmuir probe measurements of inverted fireballs (FBs) in hydrogen plasma. Spatial profiles of the plasma potential and the electron densities were taken inside as well as outside an inverted FB. It was demonstrated that the plasma potential inside the FB is homogeneous and exhibits a strongly enhanced electron density. Furthermore it is demonstrated that FBs in a non-spherical geometry can be produced.