Fig. 2From: Recovery and validation of Mars ionospheric electron density profiles from Mariner 9Geographical coverage of the Mariner 9 electron density profiles. Crosses and squares indicate occultations from the primary and extended missions, respectively. The filled circle at 39.1° S, 209.9° E highlights orbit 4. Colors indicate the magnetic field strength at 150 km based upon the model of Arkani-Hamed (2004)Back to article page