From top to bottom: (a) energy-time spectrograms of oxygen ions; blue and red curves show the electron number density (MARSIS) and total number of counts in the ‘oxygen channel’ (Ei ≤ 50 eV). (b) energy-time spectrograms of electron fluxes; the dotted red curves show the altitude of MEX. (c) height profiles of the electron number densities on the inbound (blue) and outbound (red) orbital legs. Solar wind dynamic pressure corresponding to the inbound and outbound legs is also given. (d) height profiles of oxygen ions measured by IMA/ASPERA on the inbound and outbound parts of the MEX orbits. (e) solar zenith angle and the crustal magnetic field taken from the Cain model.