Abstract
The plasma radiation from a pulsed streamer discharge at 0.2–2 Torr in the air has been studied. Pulsed discharges at these pressures at a distance from the electrodes consist of diffuse ionization waves and, therefore, are widely studied, including within the framework of modeling high-altitude atmospheric discharges, in particular, columnar sprites. Two setups with different excitation parameters were used to excite air at low pressures. When plasma was formed using a capacitive single-barrier discharge feeding by voltage pulses with an amplitude of up to 7 kV, diffuse red-colored ionization waves up to 120 cm long were formed. Due to the formation of an ionization wave by a discharge forming by voltage pulses with an amplitude of up to 33 kV between two electrodes, X-ray and runaway electron beam were recorded.
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