Auroral arc widths are observed to extend from 100 s of kilometers down to several 10 s of meters. The largest widths mapped outward along auroral field-lines correspond to that of plasma gradients and flow shears in the equatorial magnetosphere. The smallest widths correspond to the fundamental plasma length scales along auroral field-lines. Larger scale arcs invariably have smaller scale features imbedded within them. The physics of auroral arcs is therefore multi-scale in nature. In this brief report we review some recent results from the FAST spacecraft characterizing the k-spectra of Alfvénic electromagnetic fluctuations associated with electron fluxes which drive visible aurora. These results suggest a nearly scale-invariant quality to the acceleration process over much of the range of scales reported for auroral arc widths. We then present a case study using observations from the REIMEI spacecraft to qualitatively demonstrate that the broad scale-range of variations observed in electromagnetic fields is represented in the multi-scale structuring of auroral forms. Together, observations from these spacecraft suggest that auroral arc structuring is a consequence of energy transport across scales facilitated by non-linear coupling similar to that which occurs in large Reynolds number fluid flows.