Effect of relative air humidity on the properties of diffuse plasma jets
N.P. Vinogradov, V.F. Tarasenko
High Current Electronics Institute of the Siberian Branch of the RAS, Tomsk, Russia
Keywords: atmospheric air, low pressure discharges, capacitive discharge, plasma diffuse jet, analogs column sprite
Abstract
The paper is devoted to the study of the effect of relative air humidity on the color of diffuse plasma jets (DPJs) initiated by a capacitive discharge at pressures of 0.03-1 torr, which are analogues of columnar sprites. Photographs and emission spectra of DPJs are given, as well as a photograph of a sprite. The results of the study showed that a decrease in the relative air humidity at pressures less than 0.1 torr contributes to the preservation of the red color of DPJs. Quantifying the average number of red and blue pixels in the photographs confirms this result. It has been established that an increase in the reduced electric field leads to a change in the color and spectrum of the periodic domain structure due to an increase in the intensity of the emission of the bands of the first negative nitrogen system.
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