Figure 7

Modeled 1-D ion composition. [18] modeled 14 ions: CO₂ ⁺, Ar⁺, N₂ ⁺, O⁺(4S), O⁺(2D), O⁺(2P), CO⁺, C⁺, N⁺, O₂ ⁺, NO⁺, O⁺⁺, H⁺, He. As seen the model matches the total ion/electron measurements of Viking 1 with an assumed upward ion flow (right frame), but many species are predicted in the models that have yet to be measured.