Method for generating an axisymmetrical jet of non-isothermal plasma by means of a high voltage electric discharge in a gas flow involving: • placing at least two electrodes to form an electric arc; • placing a direct or alternating current source; • connecting each of the electrodes to the current source: • placing a gas distributor to introduce a stream of gas into the arc formation zone; characterized in that the method further involves - Connecting each of the electrodes to the current source by means of a metal rod; - placing near to the metal rods a metal cone, which is connected to the current source by means of a capacitor and which can be moved along its axis so as to vary the distance separating it from the metal rods, said metal cone enabling the initiation of the discharge between the metal rods, so that the electric arc is propelled by the electromagnetic force and the drag force exerted by the stream of gas along the metal rods and the electrodes; and • placing in the gas distributor a device for forming the velocity profile of the gas so that the stream of gas propelling the electric arc is stabilized at all points of the resulting plasma, where the condition of stabilization is obtained by imposing a velocity profile that satisfies a relationship of the type: r * < D *: V * r * = 1. D * ≤ r * ≤ 1: V * r * + 1 − cos π r * − 1 / 2 D * − 1, and so that the condition of hydrodynamic stabilisation of the arc is met: V ≤ Re *. η / ρ. D, in which D * = D / D 0; r * = 2 r / D 0; D and D 0 are respectively the outer diameter of the jet, and the diameter of the laminarization zone and D ≤ D 0; r is the radius of the point in the jet where the normal speed V is determined; V 0 is the speed of the laminarized flow. Re* is the critical Reynolds of the stabilized flow, η and ρ are respectively the dynamic viscosity and the density of the gas propelling it at the temperature of the propellant stream. • placing at least two electrodes to form an electric arc; • placing a direct or alternating current source; • connecting each of the electrodes to the current source: • placing a gas distributor to introduce a stream of gas into the arc formation zone; characterized in that the method further involves - Connecting each of the electrodes to the current source by means of a metal rod; - placing near to the metal rods a metal cone, which is connected to the current source by means of a capacitor and which can be moved along its axis so as to vary the distance separating it from the metal rods, said metal cone enabling the initiation of the discharge between the metal rods, so that the electric arc is propelled by the electromagnetic force and the drag force exerted by the stream of gas along the metal rods and the electrodes; and - Connecting each of the electrodes to the current source by means of a metal rod; - placing near to the metal rods a metal cone, which is connected to the current source by means of a capacitor and which can be moved along its axis so as to vary the distance separating it from the metal rods, said metal cone enabling the initiation of the discharge between the metal rods, so that the electric arc is propelled by the electromagnetic force and the drag force exerted by the stream of gas along the metal rods and the electrodes; and • placing in the gas distributor a device for forming the velocity profile of the gas so that the stream of gas propelling the electric arc is stabilized at all points of the resulting plasma, where the condition of stabilization is obtained by imposing a velocity profile that satisfies a relationship of the type: r * < D *: V * r * = 1. D * ≤ r * ≤ 1: V * r * + 1 − cos π r * − 1 / 2 D * − 1, and so that the condition of hydrodynamic stabilisation of the arc is met: V ≤ Re *. η / ρ. D, in which D * = D / D 0; r * = 2 r / D 0; D and D 0 are respectively the outer diameter of the jet, and the diameter of the laminarization zone and D ≤ D 0; r is the radius of the point in the jet where the normal speed V is determined; V 0 is the speed of the laminarized flow. Re* is the critical Reynolds of the stabilized flow, η and ρ are respectively the dynamic viscosity and the density of the gas propelling it at the temperature of the propellant stream. D and D 0 are respectively the outer diameter of the jet, and the diameter of the laminarization zone and D ≤ D 0; r is the radius of the point in the jet where the normal speed V is determined; V 0 is the speed of the laminarized flow. Re* is the critical Reynolds of the stabilized flow, η and ρ are respectively the dynamic viscosity and the density of the gas propelling it at the temperature of the propellant stream.