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Table 2 Resonant ion-neutral collision frequencies. Densities are in cm\(^{-3}\). Ion temperatures (T\(_i\)) and neutral temperatures (T\(_n\)) are in Kelvin

From: An electrodynamics model for Data Interpretation and Numerical Analysis of ionospheric Missions and Observations (DINAMO)

Species Tr (K) νin (s−1)
\(\mathrm {H}^+,\mathrm {H}\) > 50 \(2.65 \times 10^{-10}n(\mathrm {H})\mathrm {T}_r^{1/2}(1-0.083\log _{10}\mathrm {T}_r)^2\)
\(\mathrm {He}^+,\mathrm {He}\) > 50 \(8.73 \times 10^{-11}n(\mathrm {He})\mathrm {T}_r^{1/2}(1-0.093\log _{10}\mathrm {T}_r)^2\)
\(\mathrm {H}^+,\mathrm {O}\) > 300 \(6.61 \times 10^{-11}n(\mathrm {O})\mathrm {T}_i^{1/2}(1-0.047\log _{10}\mathrm {T}_i)^2\)
\(\mathrm {O}^+, \mathrm {H}\) > 300 \(4.63 \times 10^{-12} n(\mathrm {H})(\mathrm {T}_n+\mathrm {T}_i/16)^{1/2}\)
\(\mathrm {O}^+, \mathrm {O}\) \(\mathrm {max}[3.68 \times 10^{-11} n(\mathrm {O}) \mathrm {T}_r^{1/2}(1-0.065\log _{10}\mathrm {T}_r)^2,\; 4.01\times 10^{-10}n(\mathrm {O})]\)
\(\mathrm {O}_2^+, \mathrm {O}_2\) \(\mathrm {max}[2.62 \times 10^{-11} n(\mathrm {O}_2) \mathrm {T}_r^{1/2} (1-0.074\log _{10}\mathrm {T}_r) ^2, \;4.08\times 10^{-10}n(\mathrm {O}_2)]\)