Frequency effects of plasma bullets in atmospheric glow discharges

Pointlike plasma bullets have been reported in atmospheric plasma jets below 50 kHz. This paper presents 10-ns images of both pointlike and striplike plasma bullets generated at frequencies between 80 and 394 kHz. The striplike plasma bullets are always present, whereas the pointlike ones are suppressed at sufficiently high frequencies. Abel-converted images show that the pointlike plasma bullets have a long tail of 4.5 cm extended to the anode region.