Electrical discharges in long air gaps, referred to as 'leader discharges', usually propagate
with transient thermal plasma channels. The gas temperature evolution of the channels …

In this paper, we observe the dynamic expansion process of positive leader channels under
impulses with different rise times in a 1-m air gap using a Mach-Zehnder interferometry and …

Leader discharge plays a key role in the breakdown of long air gap and the evolution of
natural lightning discharges. Prior to the formation of continuous leaders, streamer corona …

In this study, we present a comprehensive investigation of positive leader discharges, with
the aim of enhancing our understanding of leader decay and reactivation. Our approach …

This paper presents an original investigation into time-resolved moiré deflectometry (MD) for
gas temperature measurements of long sparks in air. In order to perform a rigorous …

The streamer zone of positive leader during the breakthrough phase of long sparks was
experimentally investigated with two methods. One of the methods is the analysis of …

This paper presents an original investigation into the axial evolution of streamer stem during
a dark period in long spark discharge. To obtain thermodynamic morphology and …

This study presents the discharge process on rod–rod electrodes under oscillating lightning
impulse voltage. For this purpose, a measurement system has been developed to record the …

The diameter of a stem, a common origin point for streamers where the transition from the
streamer to the leader takes place, has a significant effect on the simulation of streamer-to …

The temperature measurement for discharge channels plays an important role in studying
the mechanism of long sparks and natural lightning, in which cases the high-speed …