Fig. 8

image

Total ion (black), H2O+ (blue), and H3O+ (red) ion number density profile at a solar zenith angle of χ = π∕2 and for six different outgassing rates Q: 1025 s−1 (left panel, circles), 1026 s−1 (left panel, dashed line), 1027 s−1 (left panel, pluses), 1025 s−1 (right panel, circles), 1029 s−1 (right panel, dashed line), 1030 s−1 (right panel, pluses). The number densities were scaled accordingly to be plotted as a dimensionless parameter. The vertical line corresponds to the lowest upper bound of the plasma density for χ = π∕2 in dimensionless units, i.e., 0.1657 × 2∕π ≈ 0.1055 (see Eq. (24)). The expanding velocity is set to Un = 600 m⋅s−1.

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