Evaluated atomic data concerning the 4s and 4p configurations of Ar I are averaged in order to simplify their use in various cases of\nAr plasma modeling and diagnostics. These data are used here to model a low-power arcjet, running with Argon at low pressure.\nIn so doing, they are explicitly introduced in the chemical processes included in a fluid Navier-Stokes type code, allowing for\nevaluation of the spectroscopically measurable level populations and of the electronic temperatures. The characteristics of the\nmodel are described and the main processes are discussed in view of the results of the calculations.
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