Fig. 7

Elliptic power-law spectrum (left panel) and a Gaussian fit using the moment tensor method (right panel). Color bar scale shows levels of the spectral energy density in the two-dimensional wavevector domain, so the squared fluctuation amplitude divided by the square of wavenumber interval. The fluctuation amplitudes are normalized to the mean field (e.g., magnetic field) and the wavenumber interval to the ion inertial scale. The color bar scale is normalized here, and reads \(E/E_{kk}\), where \(E_{kk} = B_0^2 V_{\mathrm{A}}^2/\Omega _{\mathrm{i}}^2\)