Logarithmic density distribution of the protolunar disk midplane with overplotted lines corresponding to the x- and y-components of the magnetic field for a B₀ ≃ 1 kG, Δx ≃ 175 km magnetized giant impact simulation. (a) Quasi-equilibrium protolunar disk, ∼140 hr post-impact, hosting a mainly toroidal magnetic field. (b) The onset of the MRI, ∼174 hr post-impact. (c) The peak of the dimensionless α parameter around R ≃ 3R_⊕, ∼190 hr post-impact. (d) Full MHD turbulence in the protolunar disk, ∼220 hr post-impact.