Magnetic (solid) and kinetic (dashes) energy distribution over the multipole degrees l (left), and over the radius (right) for three models representing the same 1 M_J planet at different evolutionary stages (0.4, 2.1, and 6.5 Gyr). The spectra have been averaged in time over the saturated state. The location of r_m is marked with a dot in the radial plots. The physical units are obtained by multiplying by the factor ρ₀ d⁵ E² Ω², where ρ₀, d and E depend on each model and Ω = 1.76 ⋅ 10⁻⁴, i.e., the Jovian value.