Shown are the logarithm of the Alfvén speed (left) and the logarithm of the plasma β (right) as functions of the vertical magnetic field, as resolved in the Bifrost simulation ch024031_by200bz005 (Finley et al. 2022) at the height of the COCONUT GCM inner boundary, at ∼10 Mm. The red arrows point at the maximum computed Alfvén speed (left) and the minimum resolved plasma β (right) in this simulation.