What causes these striations? How does the voltage and pressure of the discharge affect the size, color, number, and spacing of the striations? I have produced a discharge with striations with fairly low voltage (under 15kv) and pressure 10 - 100pa, and the striations are very thin, compact, and numerous. Most of the striations I see online are very thick and few in number. This is also a noisy dc supply so that may affect things as well. I am having a difficult time finding information on the process that causes this.