Novel high-resolved spectroscopic studies of DC positive streamer corona. I. Experimental results

We have carried out cross-correlated high-resolved electrodynamical and spectroscopic measurements of different characterizations in high-stable regime of the DC positive streamer corona in short gap in atmospheric pressure laboratory air. Special attention was paid to measurement of absolute intensities of the second positive (SPS) and first negative (FNS) systems of molecular nitrogen as well as to further improvement of spatiotemporal resolution along with the high synchronization and stability. Various supporting characteristics such as the synchronous anode and cathode electric current waveforms, the streamer velocity, the gas temperature within streamer channel region have been measured and presented as well.