Abstract
This paper presents the results of theoretical studies of high-pressure (~10's and 100s of Torr) dc discharges in argon. The diffuse, constricted-stratified, and constricted discharge modes are studied using a developed model. Two transitions were studied. One of them is transition from the constricted-stratified mode to the constricted mode. This transition occurs smoothly, without any jumps of plasma parameters. The other is a hysteresis transition between the diffuse and the constructed-stratified mode. It occurs by a jump and is accompanied by a several orders of magnitude increase in the electron density at the discharge axis and an appearance of moving striations.
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