Fig. 7
From: Recovery and validation of Mars ionospheric electron density profiles from Mariner 9
Top. Six electron density profiles from the primary mission that have a “two scale height” morphology. Orbit numbers are given alongside each profile. Electron densities in the profiles from orbits 1, 3, 6, 22, 30, and 59 have been multiplied by factors of 100, 101, 102, 103, 104, and 105 respectively, for clarity. The grey regions highlight 170–230 and 270–300 km altitude. Red lines show extrapolation of fits to data in the 170–230 km altitude range. Observed densities exceed the extrapolation at 270–300 km altitude for these “two scale height” profiles. Bottom. Six electron density profiles from the primary mission that have a “one scale height” morphology. Orbit numbers are given alongside each profile. Electron densities in the profiles from orbits 10, 21, 28, 35, 46, and 57 have been multiplied by factors of 100, 101, 102, 103, 104, and 105 respectively, for clarity. Red lines and grey regions as for the top panel, but observed densities do not exceed the extrapolation at 270–300 km altitude for these “one scale height” profiles