plasmapy.formulary.braginskii.ion_viscosity(T_e, n_e, T_i, n_i, ion, m_i=None, Z=None, B: ~astropy.units.quantity.Quantity = <Quantity 0. T>, model='Braginskii', field_orientation='parallel', mu=None, theta: float | None = None, coulomb_log_method='classical') Quantity[source]

Calculate the ion viscosity.


This is the dynamic viscosity that you find for ions in the classical plasma, similar to the viscosity of air or water or honey. The big effect is the \(T^{5/2}\) dependence, so as classical plasmas get hotter they become dramatically more viscous. The ion viscosity typically dominates over the electron viscosity.

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