Fig. 9.From: Upper ionosphere of Mars is not axially symmetrical(a) Mean fluxes of low-energy ionospheric oxygen ions measured by IMA during 3 years of MEX observations are plotted as a function of the altitude and the strength of crustal magnetic field. (b, c) ‘Ionospheric’ maps measured by IMA in the northern and southern hemispheres at the geographic longitudes 90°–240°, respectively.Back to article page