Effect of non-equilibrium ionization on the solar EUV/X-ray spectral diagnosis

In the next generation solar missions like Solar-C_EUVST, we expect higher spatial and temporal resolutions within various wavelengths. The optically thin emission observed in EUV and X-ray spectrometers allows us to diagnose the various plasma properties such as the line-of-sight velocity, electron temperature and density, or chemical composition, (velocity) differential emission measure (DEM), or small-scale heating rate. One assumption used in such diagnostics is that the population of each element can be approximated by the ionization equilibrium. Because the ionization timescale in the solar corona sometimes reaches several minutes, the assumption of the ionization equilibrium is violated in the high temporal cadence or in the rapidly moving phenomena. In this study, we show new radiative MHD simulations with the non-equilibrium ionization module in our RMHD code RAMENS and explore the possible impact on the plasma diagnosis in the future observations.