Fig. 3. Energy versus the L_M spectra of differential energy fluxes of ions observed by the MEP-i (9.6 to 184.2 keV q⁻¹) in Orbit 2.

(A) H⁺. (B) O⁺. (C) O⁺⁺. Black thin curves indicate cumulative energy density ratios of 0.25 and 0.75. The energy range between 0.25 and 0.75 is a good indicator of the energy range that contributes dominantly when the spacing is narrow. In such cases, the ratio of 0.5 (thick black curve) roughly indicates the center of the energy range. White, light gray, and gray curves indicate the first adiabatic invariants of 0.01, 0.03, and 0.1 keV q⁻¹ nT⁻¹, respectively, for ions with pitch angles of 90°.