Spatial distributions of electron density, electron temperature and plasma potential were measured in an energetic are with rotating electrostatic probe on the condition of 1000-4000 gauss magnetic field strength, 3x10
-2-3x10
-5 torr argon gas pressure and 50-200 A discharge current. The density and temperature obtained at the axis of arc plasma column were about 10
14 cm
-3 and 2x10
5 K, respectively. At the pressure lower than 10
-4 torr the spatial distribution of plasma potential were connected with ion Larmor radius. The density and temperature distributions were examined for the fully ionized plasma. At the higher pressure the effects of collisions between the charged particles and gas molecules on the characteristics of plasma were investigated.
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