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Explosive phenomena are known to trigger a wealth of shocks in warm plasmaenvironments, including the solar chromosphere and molecular clouds where themedium consists of both ionised and neutral species. Partial ionisation iscritical in determining the behaviour of shocks, since the ions and neutralslocally decouple, allowing for substructure to exist within the shock.Accurately modelling partially ionised shocks requires careful treatment of theionised and neutral species, and their interactions. Here we study apartially-ionised switch-off slow-mode shock using a multi-level hydrogen modelwith both collisional and radiative ionisation and recombination rates that areimplemented into the two-fluid (P\underline{I}P) code, and study physicalparameters that are typical of the solar chromosphere. The multi-level hydrogenmodel differs significantly from MHD solutions due to the macroscopic thermalenergy loss during collisional ionisation. In particular, the plasmatemperature both post-shock and within the finite-width is significantly coolerthat the post-shock MHD temperature. Furthermore, in the mid to lowerchromosphere, shocks feature far greater compression then their single-fluidMHD analogues. The decreased temperature and increased compression reveal theimportance of non-equilibrium ionised in the thermal evolution of shocks inpartially ionised media. Since partially ionised shocks are not accuratelydescribed by the Rankine-Hugoniot shock jump conditions, it may be incorrect touse these to infer properties of lower atmospheric shocks.

Partially-ionised two-fluid shocks with collisional and radiative ionisation and recombination -- multi-level hydrogen model