Abstract
The influence of a transverse magnetic field on the weakly ionized plasma instability caused by competition between the diffusion and thermodiffusion processes is investigated. A criterion of this so-called thermocurrent instability for the plasma carrying a current in electric and magnetic fields is derived. It is shown that the transverse magnetic field is favourable to instability growth. This is associated with the disturbances propagating at an angle to the electric field and with a change in the electron transport parameters. From a calculation of the electron transport coefficients, boundaries of the instability region are obtained in He, N2 and CO2.
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