This is the same simulation as in the previous slide ["Magnetic RDIs in a Piece of an HII Region”], except now showing the dust, in a 3D plot (xyz isometric projection). This is an example of the RDIs in magnetized gas. Specifically, the movie shows an isometric xyz projection, with the initial magnetic field in the vertical direction (z), the acceleration of the grains in the x-z (width-height) direction, and the mutually perpendicular direction is depth (y). Every point is one of the simulation dust grains (we randomly pick 1,000,000 of them to show), colored by the log of the local density of dust relative to the box-averaged mean (see colorbar). This particular box is motivated by parameters typical in HII regions, at roughly ~0.1 pc from a bright O star, with the box size being something like ~50 au on a side. Here the dust is charged and feels both magnetic/Lorentz and drag/Coulomb forces, and it is drifting mildly super-sonically in a medium with plasma beta of ~10. For more details, see Seligman et al. (in prep.).