From authors: Victor F. Tarasenko and Dmitry A. Sorokin Institute of High Current Electronics E-mail: VFT@loi.hcei.tsc.ru
Lines 173-175 «Based on the brightness of the track glow, the plasma concentration at the particle surface increases with distance from the cathode.» Again, it is not clear how the plasma density on the particle surface can affect the brightness of the track glow.