Ratio of plasma frequency of electrons to electron–neutral collisional frequency (top, ω_pe ∕ν_ne = 1 – black dashed line) and the Debye length, λ_D (bottom) of all 97 1D profiles. For length scales less than the Debye length, a test charge experiences the influence of a charge imbalance inside a Debye sphere. The horizontal black dashed line at L = 10³ m represents the pressure scale height in the mid-atmosphere for comparison. The red lines correspond to the dayside (ϕ = 60.0°…0.0°…300.0°). The blue lines are the nightside profiles (ϕ = 120.0°…240.0°). The grey solid lines corresponds to the evening terminator profiles (ϕ = 90.0°). The grey dashed lines are the morning terminator profiles (ϕ = −90.0° or 270.0°)