Fig. 4. Spatial profiles of the energy densities of ions and magnetic field intensity.

(A to C) Energy densities of ions observed by the MEP-i (9.6 to 184.2 keV q⁻¹) in Orbits 1 to 3 (see Materials and Methods). (D to F) Proportion of each ion species in the total energy density in each L_M bin in Orbits 1 to 3. (G) Observed magnetic field intensity. (H) Magnetic field intensity ratio (observed / the IGRF model). (I) Ion ${\mathrm{\beta }}_{\perp }$ (see Materials and Methods). The low-count interval in Orbit 1, where the energy density of the most abundant H⁺ was below 5 keV cm⁻³, was hatched. perp, perpendicular.