Fig. 6.

Inertial mode observed in the induced magnetic field in the 60-cm spherical Couette device. Here, the magnetic field is represented as an equal area projection at the outer sphere where blue is outward pointing magnetic field and red inward. The left image shows the observed magnetic field in a state with a dominant $l=3$ inertial mode; the right image shows the computed magnetic field that would be induced by a whole-sphere inertial mode of the same l, m. The frequencies of the experimentally observed and analytically computed modes are comparable. Adapted from Kelley et al. (2007)