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Table 3
Definition of the four ion-neutral coupling regimes used throughout this work.
| Coupling regime | Vnc/ρc [cm3 g−1 s−1] | Physical interpretation |
|---|---|---|
| NC (No Coupling) | 0 | Neutrals and charges evolve independently; no momentum exchange occurs between the two fluids. |
| LC (Low Coupling) | 7.5 × 1019 | Weak coupling regime: ion-neutral interactions are present but insufficient to enforce coherent motion; partial decoupling persists. |
| IC (Intermediate Coupling) | 7.5 × 1020 | Transitional regime: ion-neutral interactions are dynamically important but do not impose a single-fluid behaviour; ambipolar diffusion effects are maximal. |
| HC (High Coupling) | 7.5 × 1021 | Strong coupling regime approaching the fully coupled asymptotic limit; charges and neutrals move nearly coherently as a single fluid. |
| HC-Lim (High Coupling Limit) | 7.5 × 1022 | Totally coupled regime |
Notes. The regimes are classified according to the effective collision frequency per unit charged density, νnc/ρc, which controls the strength of momentum exchange between ions and neutrals.
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