Abstract
Diffusion caused by a combined influence of the electric current and Hall effect is considered, and it is argued that such diffusion can form inhomogeneities of a chemical composition in plasma. The considered mechanism can be responsible for the formation of element spots in laboratory and astrophysical plasmas. This current-driven diffusion can be accompanied by propagation of a particular type of waves in which the impurity number density oscillates alone. These compositional waves exist if the magnetic pressure in plasma is much greater than the gas pressure.
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Urpin, V. Diffusion in plasma: The Hall effect, compositional waves, and chemical spots. Plasma Phys. Rep. 43, 307–314 (2017). https://doi.org/10.1134/S1063780X1703014X
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DOI: https://doi.org/10.1134/S1063780X1703014X